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50-27-1

Basic Information
CAS No.: 50-27-1
Name: Estriol
Molecular Structure:
Molecular Structure of 50-27-1 (Estriol)
Formula: C18H24O3
Molecular Weight: 288.39
Synonyms: 1,3,5-Oestratriene-3beta,16alpha,17beta-triol;NSC-12169;1,3,5(10)-Estratriene-3,16-alpha,17beta-triol;(16.alpha.,17.beta.)-Oestra-1,3,5(10)-triene-3,16,17-triol;16.alpha.-Hydroxyestradiol;16.alpha.,17.beta.-Estriol;1,3,5-Estratriene-3beta,16alpha,17beta-triol;1,3, 5(10)-Estratriene-3,16.alpha., 17.beta.-triol;Estra-1,3,5(10)-triene-3,16,17-triol,(16R,17a)-;Estra-1,3,5(10)-trien-3, 16.alpha., 17.beta.-triol;16-alpha-Hydroxyoestradiol;16.alpha.-Estriol;16alpha-Hydroxy-17beta-estradiol;Triovex;Ovestrion;Oestra-1,3,5(10)-triene-3,16alpha,17beta-triol;3, 16.alpha.,17.beta.-Estriol;Synapause;Klimoral;Folicular hormone;16-alpha-Hydroxyestradiol;3,16.alpha., 17.beta.-Trihydroxy-1,3,5(10)-estratriene;Hemostyptanon;Estra-1,3,5(10)-triene-3,16,17-triol, (16alpha,17beta)-;Estra-1,3,5(10)-trien-3,16alpha,17beta-triol;Estriolo [Italian];Tridestrin;Estra-1,3,5(10)-trien-3,16.alpha., 17.beta.-triol;3,16-alpha,17-beta-Oestriol;3,16-alpha,17-beta-Estriol;Oestra-1,3,5(10)-triene-3,16.alpha., 17.beta.-triol;Aacifemine;16.alpha.,17.beta.-Oestriol;Deuslon-A;Oestratriol;3,16alpha,17beta-Trihydroxy-1,3,5(10)-estratriene;3,16.alpha., 17.beta.-Trihydroxy-.delta.-1,3,5-oestratriene;16.alpha.-Hydroxyoestradiol;3,16alpha,17beta-Trihydroxy-delta-1,3,5-oestratriene;A 13610;Oestriolum;Trihydroxyoestrin;Holin V;Thulol;Triodurin;Orestin;Estra-1,3,5(10)-triene-3,16.alpha.,17.beta.-triol;Oestriol [Steroidal oestrogens];Overstin;Orgastyptin;Ovestin;Estriel;(16alpha,17beta)-estra-1,3,5(10)-triene-3,16,17-triol;Theelol;Stiptanon;(16alpha,17beta)-Oestra-1,3,5(10)-triene-3,16,17-triol;
EINECS: 200-022-2
Density: 1.255 g/cm3
Melting Point: 280-282 °C(lit.)
Boiling Point: 469 °C at 760 mmHg
Flash Point: 220.8 °C
Solubility: 3.2mg/L(25 oC)
Appearance: White crystalline powder
Hazard Symbols: ToxicT
Risk Codes: 60-61-40-45
Safety: 53-22-36/37/39-45-36/37
Transport Information:
PSA: 60.69000
LogP: 2.58000
Synthetic route
79258-14-3

2,4-dibromo-3,16α-dihydroxy-1,3,5(10)-estratrien-17-one

50-27-1

Estriol

Conditions
ConditionsYield
With sodium tetrahydroborate; palladium dichloride In methanol at 0℃; for 2h;96%
With sodium borodeuteride; palladium dichloride In deuteromethanol at 0℃; for 1h;92%
Multi-step reaction with 4 steps
1: 85 percent / Ag2CO3 / benzene / 72 h / Ambient temperature
2: 95 percent / NaBH4, PdCl2 / methanol / 2 h / 0 °C
3: 65 percent / aq. 2M NaOH / methanol / Ambient temperature
4: 24 h / 38 °C / beef-liver β-glucuronidase, 0.1M acetate buffer (pH 4.6)
View Scheme
566-76-7

16α-hydroxyestrone

50-27-1

Estriol

Conditions
ConditionsYield
With methanol; sodium tris(acetoxy)borohydride In 1,4-dioxane at 20 - 25℃;94%
123715-88-8

estra-1,3,5(10)-triene-3,16α,17β-triol 3-methoxyethyl ether

50-27-1

Estriol

Conditions
ConditionsYield
With sec.-butyllithium In tetrahydrofuran; N,N-dimethyl-formamide at -78℃;90%
53-16-7

Estrone

A

50-28-2

estradiol

B

50-27-1

Estriol

Conditions
ConditionsYield
Isolierung aus dem Harn von Maennern nach Injektion von (+)-O-Acetyl-oestron;
1474-53-9

3-methoxy-estra-1,3,5(10)-triene-16α,17β-diol

50-27-1

Estriol

Conditions
ConditionsYield
With hydrogen bromide; acetic acid
1247-71-8

3,16α-diacetoxy-1,3,5(10)-estratrien-17-one

50-27-1

Estriol

Conditions
ConditionsYield
With lithium aluminium tetrahydride; diethyl ether; benzene
1247-71-8

3,16α-diacetoxy-1,3,5(10)-estratrien-17-one

A

50-27-1

Estriol

Conditions
ConditionsYield
With lithium aluminium tetrahydride; diethyl ether
69744-63-4

3,17β-diacetoxy-16α,17α-epoxy-estra-1,3,5(10)-triene

50-27-1

Estriol

Conditions
ConditionsYield
With lithium aluminium tetrahydride; diethyl ether; benzene
472-57-1

3-Hydroxyestra-1,3,5(10)-triene 16β,17β-Oxide

A

50-27-1

Estriol

B

793-89-5

16,17-Epiestriol

Conditions
ConditionsYield
With acetic acid Erwaermen des Reaktionsprodukts mit aethanol. KOH;
50-28-2

estradiol

A

53-16-7

Estrone

B

50-27-1

Estriol

C

2487-49-2

3,7α-dihydroxy-estra-1,3,5(10)-trien-17-one

D

1476-78-4

6α-hydroxyestrone

Conditions
ConditionsYield
With disodium hydrogenphosphate; potassium dihydrogenphosphate; D-glucose; oxygen; sodium chloride; calcium chloride; magnesium chloride at 37℃; for 0.166667h; Kinetics; Product distribution; Mechanism; <6,7-3H>-labeled, metabolism in uterine tissue from 6 months old prepubertal pigs;
53-16-7

Estrone

A

50-28-2

estradiol

B

50-27-1

Estriol

C

2487-49-2

3,7α-dihydroxy-estra-1,3,5(10)-trien-17-one

D

1476-78-4

6α-hydroxyestrone

Conditions
ConditionsYield
With disodium hydrogenphosphate; potassium dihydrogenphosphate; D-glucose; oxygen; sodium chloride; calcium chloride; magnesium chloride at 37℃; for 0.166667h; Kinetics; Product distribution; <6,7-3H>-labeled, metabolism in uterine tissue from 6 months old prepubertal pigs;
1852-44-4

sodium 3,17β-dihydroxyestra-1,3,5(10)-trien-16α-yl-β-D-glucopyranosuronate

50-27-1

Estriol

Conditions
ConditionsYield
at 38℃; for 24h; beef-liver β-glucuronidase, 0.1M acetate buffer (pH 4.6);
99700-34-2

16α,17β,19-trihydroxyandrost-4-en-3-one

50-27-1

Estriol

Conditions
ConditionsYield
for 1h; Mechanism; biosynthesis labelled with isotops;
99700-35-3

16α,17β-dihydroxyandrost-4-ene-3,19-dione

50-27-1

Estriol

Conditions
ConditionsYield
for 0.5h; Mechanism; biosynthesis labelled with isotops;
Conditions
ConditionsYield
β-glucoronidase I In water at 37℃; for 0.166667h; Product distribution; substrate specifity of enzyme;
β-glucoronidase II In water at 37℃; for 0.166667h; Product distribution; substrate specifity of enzyme;
Conditions
ConditionsYield
β-glucoronidase II In water at 37℃; for 0.166667h; Product distribution; substrate specifity of enzyme;
19590-54-6

2,4-dibromoestratriol

A

50-27-1

Estriol

B

99477-24-4

4-bromoestra-1,3,5(10)-triene-3,16α,17β-triol

Conditions
ConditionsYield
With hydrogen; palladium on activated charcoal In ethanol Ambient temperature; Yield given;
50-28-2

estradiol

A

5976-61-4, 72704-99-5

4-Hydroxyestradiol

B

362-05-0

2-Hydroxyestradiol

C

50-27-1

Estriol

Conditions
ConditionsYield
With cytochrome P450 1A2; NADPH-generating system In phosphate buffer at 37℃; for 0.25h; pH=7.4; Enzyme kinetics; Further Variations:; Reagents; time; Oxidation;
60-29-7

diethyl ether

69744-63-4

3,17β-diacetoxy-16α,17α-epoxy-estra-1,3,5(10)-triene

71-43-2

benzene

lithium alanate

lithium alanate

50-27-1

Estriol

3,17β-dihydroxy-estratrien-(1,3,5(10))-one-(16)

3,17β-dihydroxy-estratrien-(1,3,5(10))-one-(16)

A

50-27-1

Estriol

B

547-81-9

epiestriol

Conditions
ConditionsYield
With sodium amalgam; ethanol; acetic acid at 40℃;
64-17-5

ethanol

6199-65-1, 566-75-6

16-oxoestradiol

64-19-7

acetic acid

sodium-amalgam

sodium-amalgam

A

50-27-1

Estriol

B

547-81-9

epiestriol

Conditions
ConditionsYield
at 40℃;
53-16-7

Estrone

50-27-1

Estriol

Conditions
ConditionsYield
Multi-step reaction with 3 steps
1: cupric bromide / methanol / 32 h / Heating
2: 90 percent / pyridine, sodium hydroxide / H2O / 3 h / Ambient temperature
3: 96 percent / NaBH4, PdCl2 / methanol / 2 h / 0 °C
View Scheme
Multi-step reaction with 6 steps
1: cupric bromide / methanol / 32 h / Heating
2: 90 percent / pyridine, sodium hydroxide / H2O / 3 h / Ambient temperature
3: 85 percent / Ag2CO3 / benzene / 72 h / Ambient temperature
4: 95 percent / NaBH4, PdCl2 / methanol / 2 h / 0 °C
5: 65 percent / aq. 2M NaOH / methanol / Ambient temperature
6: 24 h / 38 °C / beef-liver β-glucuronidase, 0.1M acetate buffer (pH 4.6)
View Scheme
Multi-step reaction with 3 steps
1: cupric bromide / methanol / 24 h / Heating
2: 90 percent / pyridine, sodium hydroxide / H2O / 3 h / Ambient temperature
3: 96 percent / NaBH4, PdCl2 / methanol / 2 h / 0 °C
View Scheme
18841-95-7

methyl 3,17β-dihydroxyestra-1,3,5(10)-trien-16α-yl-2,3,4-tri-O-acetyl-β-D-glucopyranosuronate

50-27-1

Estriol

Conditions
ConditionsYield
Multi-step reaction with 2 steps
1: 65 percent / aq. 2M NaOH / methanol / Ambient temperature
2: 24 h / 38 °C / beef-liver β-glucuronidase, 0.1M acetate buffer (pH 4.6)
View Scheme
79258-13-2

methyl 1-O-<2,4-dibromo-3-hydroxy-17-oxo-estra-1,3,5(10)-trien-16α-yl>-2,3,4-tri-O-acetyl-β-D-glucopyranosiduronate

50-27-1

Estriol

Conditions
ConditionsYield
Multi-step reaction with 3 steps
1: 95 percent / NaBH4, PdCl2 / methanol / 2 h / 0 °C
2: 65 percent / aq. 2M NaOH / methanol / Ambient temperature
3: 24 h / 38 °C / beef-liver β-glucuronidase, 0.1M acetate buffer (pH 4.6)
View Scheme
79258-15-4

2,4,16α-tribromo-3-hydroxy-1,3,5(10)-estratrien-17-one

50-27-1

Estriol

Conditions
ConditionsYield
Multi-step reaction with 2 steps
1: 90 percent / pyridine, sodium hydroxide / H2O / 3 h / Ambient temperature
2: 96 percent / NaBH4, PdCl2 / methanol / 2 h / 0 °C
View Scheme
Multi-step reaction with 5 steps
1: 90 percent / pyridine, sodium hydroxide / H2O / 3 h / Ambient temperature
2: 85 percent / Ag2CO3 / benzene / 72 h / Ambient temperature
3: 95 percent / NaBH4, PdCl2 / methanol / 2 h / 0 °C
4: 65 percent / aq. 2M NaOH / methanol / Ambient temperature
5: 24 h / 38 °C / beef-liver β-glucuronidase, 0.1M acetate buffer (pH 4.6)
View Scheme
20592-42-1

estra-1,3,5(10),16-tetraene-3,17-diol diacetate

50-27-1

Estriol

Conditions
ConditionsYield
Multi-step reaction with 3 steps
1: bromine
2: lithium alanate; diethyl ether / Erwaermen des Reaktionsprodukts mit aethanol. Kalilauge
3: acetic acid / Erwaermen des Reaktionsprodukts mit aethanol. KOH
View Scheme
Multi-step reaction with 2 steps
1: peroxybenzoic acid; benzene
2: LiAlH4; diethyl ether; benzene
View Scheme
Multi-step reaction with 3 steps
1: 3-chloro-benzenecarboperoxoic acid / ethyl acetate / 7 - 20 °C
2: water; sulfuric acid / 1,4-dioxane / 10 - 20 °C
3: sodium tris(acetoxy)borohydride; methanol / 1,4-dioxane / 20 - 25 °C
View Scheme
1239-35-6

16α-bromo-3-hydroxy-1,3,5(10)-estratrien-17-one 3-acetate

50-27-1

Estriol

Conditions
ConditionsYield
Multi-step reaction with 2 steps
1: lithium alanate; diethyl ether / Erwaermen des Reaktionsprodukts mit aethanol. Kalilauge
2: acetic acid / Erwaermen des Reaktionsprodukts mit aethanol. KOH
View Scheme
B-ipc-9-BBN

B-ipc-9-BBN

60-29-7

diethyl ether

53-16-7

Estrone

141-43-5

ethanolamine

75-07-0

acetaldehyde

50-27-1

Estriol

50-27-1

Estriol

6199-65-1, 566-75-6

16-oxoestradiol

Conditions
ConditionsYield
With 4-methyl-morpholine; 6C6H15P*4CF3O3S(1-)*2Ru(2+); acetone at 65℃; for 5h; Inert atmosphere; Sealed tube;97%
50-27-1

Estriol

19590-54-6

2,4-dibromoestratriol

Conditions
ConditionsYield
With N-Bromosuccinimide In N,N-dimethyl-formamide for 24h; Ambient temperature;95%
50-27-1

Estriol

108-24-7

acetic anhydride

805-26-5

3,16α,17β-Estratriol 16,17-diacetate

Conditions
ConditionsYield
With boron trifluoride diethyl etherate In tetrahydrofuran at 0℃; for 4h; Schlenk technique;94%
With boron trifluoride diethyl etherate In tetrahydrofuran for 0.333333h; Ambient temperature; Yield given;
50-27-1

Estriol

108-24-7

acetic anhydride

2284-32-4

estriol triacetate

Conditions
ConditionsYield
With pyridine for 24h; Ambient temperature;93.2%
at 100℃;
With pyridine at 95℃;
137-43-9

Cyclopentyl bromide

50-27-1

Estriol

1169-79-5

quinestradol

Conditions
ConditionsYield
With potassium hydroxide In ethanol90%
1185733-70-3

2,2,2-trichloroethoxysulfuryl 2-methyl-3-methylimidazolium triflate

50-27-1

Estriol

1313434-26-2

C20H25Cl3O6S

Conditions
ConditionsYield
With 1,8-diazabicyclo[5.4.0]undec-7-ene In dichloromethane; N,N-dimethyl-formamide at 20℃; for 0.1h; chemoselective reaction;88%
50-27-1

Estriol

18162-48-6

tert-butyldimethylsilyl chloride

104202-84-8

16α-(tert-butyldimethylsilyloxy)-1,3,5(10)-estratrien-3,17β-diol

Conditions
ConditionsYield
82%
114615-82-6

tetrapropylammonium perruthennate

3,16α-Bis(dimethylthexylsilyl ether)

3,16α-Bis(dimethylthexylsilyl ether)

50-27-1

Estriol

566-76-7

16α-hydroxyestrone

Conditions
ConditionsYield
In dichloromethane76%
627-42-9

2-chloroethyl methyl ether

50-27-1

Estriol

123715-88-8

estra-1,3,5(10)-triene-3,16α,17β-triol 3-methoxyethyl ether

Conditions
ConditionsYield
With potassium carbonate; potassium iodide In N,N-dimethyl-formamide at 90 - 95℃; for 15h;75%
50-27-1

Estriol

10199-89-0

NBD chloride

(8R,9S,13S,14S,16R,17R)-13-Methyl-3-(7-nitro-benzo[1,2,5]oxadiazol-4-yloxy)-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthrene-16,17-diol

Conditions
ConditionsYield
With 18-crown-6 ether; potassium carbonate In acetonitrile at 80℃; for 0.5h;75%
50-27-1

Estriol

10β-Fluoro-3-oxo-1,4-estradien-16α,17β-diol

Conditions
ConditionsYield
With Selectfluor In acetonitrile at 45℃; for 5h; Fluorination;73%
50-27-1

Estriol

64-19-7

acetic acid

805-26-5

3,16α,17β-Estratriol 16,17-diacetate

Conditions
ConditionsYield
With copper diacetate Heating;60%
50-27-1

Estriol

65896-72-2

2,4-diiodoestra-1,3,5(10)-triene-3,16α,17β-triol

Conditions
ConditionsYield
With ammonium hydroxide; iodine In tetrahydrofuran; methanol for 0.5h;60%
50-27-1

Estriol

18162-48-6

tert-butyldimethylsilyl chloride

(13S,16R,17R)-3,17-bis(tert-butyldimethylsilyloxy)-13-methyl-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthren-16-ol

Conditions
ConditionsYield
With 1H-imidazole In N,N-dimethyl-formamide for 0.666667h;58%
50-27-1

Estriol

108-24-7

acetic anhydride

17779-98-5

(16α,17β)-16,17-dihydroxyestra-1(10),2,4-trien-3-yl acetate

Conditions
ConditionsYield
Stage #1: Estriol With sodium hydroxide In propan-1-ol for 0.166667h;
Stage #2: acetic anhydride With potassium hydrogencarbonate In propan-1-ol
57%
50-27-1

Estriol

18162-48-6

tert-butyldimethylsilyl chloride

A

134958-20-6

(13S,16R,17R)-3,16-bis(tert-butyldimethylsilyloxy)-13-methyl-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthren-17-ol

B

185910-46-7

(8R,9S,13S,14S,16R,17R)-3,16,17-Tris-(tert-butyl-dimethyl-silanyloxy)-13-methyl-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthrene

Conditions
ConditionsYield
With 1H-imidazole In N,N-dimethyl-formamide for 0.666667h; Inert atmosphere; Sealed tube;A 49%
B 49%
50-27-1

Estriol

A

99477-24-4

4-bromoestra-1,3,5(10)-triene-3,16α,17β-triol

B

2-bromoestra-1,3,5(10)-triene-3,16α,17β-triol

Conditions
ConditionsYield
With N-Bromosuccinimide In N,N-dimethyl-formamide for 24h; Ambient temperature;A 34%
B 37%
50-27-1

Estriol

2-Iodoestriol

Conditions
ConditionsYield
With iodine; copper diacetate In acetic acid at 55℃; for 22h;35%
50-27-1

Estriol

(8S,9S,13S,14S,16R,17R)-2,4,10-triazido-16,17-dihydroxy-13-methyl-6,7,8,9,10,11,12,13,14,15,16,17-dodecahydro-3H-cyclopenta[a]phenanthren-3-one

Conditions
ConditionsYield
With Amberlyst A26-resin bound iodine azide In acetonitrile at 20℃; for 3.5h; Catalytic behavior; Inert atmosphere;32%
6517-30-2

2-(α-bromoacetyl)-phenoxathiin

50-27-1

Estriol

estriol 3-(2-α-acetylphenoxathiin) ether

Conditions
ConditionsYield
With potassium hydroxide; 18-crown-6 ether In dichloromethane at 20℃;17%
50-27-1

Estriol

1474-53-9

3-methoxy-estra-1,3,5(10)-triene-16α,17β-diol

Conditions
ConditionsYield
With methanol
With methanol; diethyl ether; chloroform
50-27-1

Estriol

53-16-7

Estrone

Conditions
ConditionsYield
With potassium hydrogensulfate at 180 - 200℃; im Hochvakuum;
50-27-1

Estriol

76122-50-4, 91200-60-1, 91200-61-2

5ξ.10ξ-estranetriol-(3ξ.16α.17β)

Conditions
ConditionsYield
With hydrogenchloride; platinum Hydrogenation;
With ethanol; nickel at 175℃; under 110326 Torr; Hydrogenation;
50-27-1

Estriol

1236-72-2

2-methoxyestriol

50-27-1

Estriol

521-81-3

3-hydroxy-16,17-seco-estra-1,3,5(10)-triene-16,17-dioic acid

Conditions
ConditionsYield
With potassium hydroxide at 250 - 300℃;
With potassium hydroxide; water at 275℃;
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    Estriol USP, EP5

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    Estriol 50-27-1 ;Estriol ;Estriol Description: White to practically white, odorless crystalline powder Specific Rotation: +54°~+62° Loss on drying: ≤0.5% Residue on Ignition: ≤0.1% Dilutions of Impurities 0,05mg/l: < 0,2

    Antimex Chemical Limied, was founded in 2001, we are specializing in manufacturing & researching of Active pharmaceutical Ingredients,Veterinary pharm APIs,cosmetic ingredients,and

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    Estriol

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  • High quality 99% Estriol CAS 50-27-1

  • Casno:

    50-27-1

    High quality 99% Estriol CAS 50-27-1

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    · ProName: Estriol · CasNo: 50-27-1 · Molecular Formula: C10H12O · Appearance: white powder · Application: organic intermediates · DeliveryTime: prompt · PackAge: according to the clien

    HUBEI AOKS BIO-TECH CO.,LTD is located in Hubei province of China.We specialized in active pharmaceutical ingredient,pharmaceutical intermediates,veterinary drugs and agrochemicals

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Consensus Reports

IARC Cancer Review: Animal Limited Evidence IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 21 , 1979,p. 327.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Human Limited Evidence IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 21 , 1979,p. 327.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Animal Inadequate Evidence IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 6 , 1974,p. 117.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) .

Specification

1. Introduction of Estriol
Estriol Estriol is one of the three major naturally occurring estrogens. Its IUPAC Name is (8R,9S,13S,14S,16R,17R)-13-methyl-6,7,8,9,11,12,14,15,16,17-decahydrocyclopenta[a]phenanthrene-3,16,17-triol. Estriol is only produced in significant amounts during pregnancy as it is made by the placenta from 16-hydroxydehydroepiandrosterone sulfate (16-OH DHEAS), an androgen steroid made in the fetal liver and adrenal glands

2. Properties of Estriol
Index of Refraction: 1.624 
Molar Refractivity: 81.09 cm3 
Molar Volume: 229.6 cm3 
Surface Tension:  53.8 dyne/cm 
Density: 1.255 g/cm3 
Flash Point: 220.8 °C 
Enthalpy of Vaporization: 77.05 kJ/mol 
Boiling Point: 469 °C at 760 mmHg 
Vapour Pressure: 1.34E-09 mmHg at 25°C 
XLogP3-AA: 2.5
H-Bond Donor: 3
H-Bond Acceptor: 3
Structure Descriptors of Estriol (CAS NO.50-27-1):

3. Structure Descriptors of Estriol
Canonical SMILES: CC12CCC3C(C1CC(C2O)O)CCC4=C3C=CC(=C4)O
Isomeric SMILES: C[C@]12CC[C@H]3[C@H]([C@@H]1C[C@H]([C@@H]2O)O)CCC4=C3C=CC(=C4)O
InChI: InChI=1S/C18H24O3/c1-18-7-6-13-12-5-3-11(19)8-10(12)2-4-14(13)15(18)9-16(20)17(18)21/h3,5,8,13-17,19-21H,2,4,6-7,9H2,1H3/t13-,14-,15+,16-,17+,18+/m1/s1  
InChIKey: PROQIPRRNZUXQM-ZXXIGWHRSA-N

4. Toxicity of Estriol

1.    

cyt-ham:ovr 50 µmol/L

    TOLED5    Toxicology Letters. 29 (1985),201.
2.    

imp-gpg TDLo:20 mg/kg:ETA,TER

    RBBIAL    Revista Brasileira de Biologia. 5 (1945),1.
5. Safety Information of Estriol
Suspected carcinogen with experimental carcinogenic, neoplastigenic, tumorigenic, and teratogenic data. Other experimental reproductive effects. Mutation data reported. A steroid drug for the treatment of menopause. When heated to decomposition it emits acrid smoke and irritating fumes.
Hazard Codes : T (Toxic)Toxic
Risk Statements : 
R60-61-40-45 (May impair fertility;May cause harm to the unborn child;Limited evidence of a carcinogenic effect;May cause cancer)
Safety Statements : 
S53-22-36/37/39-45-36/37 (Avoid exposure - obtain special instruction before use;Do not breathe dust;Wear suitable protective clothing, gloves and eye/face protection;In case of accident or if you feel unwell, seek medical advice immediately (show label where possible);Wear suitable protective clothing and gloves)
WGK Germany : 3

6. Preparation of Estriol
Estriol is only produced in significant amounts during pregnancy as it is made by the fetal liver from 16-OHDHEAS, an androgen steroid made in the fetal adrenal glands.

7. Use of Estriol
According to researchers at UCLA's Geffen Medical School,In pregnant women with multiple sclerosis (MS), estriol reduces the disease's symptoms noticeably. Estriol can be measured in maternal blood or urine,then it can be used as a marker of fetal health and wellbeing. Estriol also can be used in the treatment of prostate disease,it also have certain curative effect for leukopenia and prostate hypertrophy.