The Molecular Structure of 2-Amino-5-nitrophenol (CAS NO.121-88-0):

Empirical Formula: C₆H₆N₂O₃
Molecular Weight: 154.1234 
IUPAC Name: 2-amino-5-nitrophenol 
Appearance: Brown to rust Crystalline powder
Product Categories: Intermediates of Dyes and Pigments;Aromatic Phenols;Phenol&Thiophenol&Mercaptan;Phenoles and thiophenoles
Nominal Mass: 154 Da
Average Mass: 154.1234 Da
Monoisotopic Mass: 154.037842 Da 
Index of Refraction: 1.688
Molar Refractivity: 38.91 cm³
Molar Volume: 101.9 cm³
Surface Tension: 78.5 dyne/cm
Density: 1.511 g/cm³
Flash Point: 173.9 °C
Enthalpy of Vaporization: 63.41 kJ/mol
Boiling Point: 364 °C at 760 mmHg
Vapour Pressure: 8.29E-06 mmHg at 25°C 
Water Solubility: insoluble
InChI
InChI=1/C6H6N2O3/c7-5-2-1-4(8(10)11)3-6(5)9/h1-3,9H,7H2
Smiles
c1(cc(c(N)cc1)O)[N+](=O)[O-]
Synonyms: CI 76535 ; 4-13-00-00903 (Beilstein Handbook Reference) ; AI3-52548 ; BRN 0972974 ; C.I. 76535 ; CCRIS 754 ; CI 76535 ; EINECS 204-503-8 ; HSDB 4168 ; NCI C55970 ; NSC 7087 ; N.C.I. C55970 ; Rodol YBA ; Ursol Yellow Brown A  

  2-amino-5-nitrophenol (CAS NO.121-88-0) can be used in the manufacture of Metal complex dyes and active black.

IARC Cancer Review: Group 3 IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of chemicals to Man . 57 (1993),p. 177.(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 Limited Evidence IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of chemicals to Man . 57 (1993),p. 177.(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 Inadequate Evidence IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of chemicals to Man . 57 (1993),p. 177.(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) . NTP Carcinogenesis Studies (gavage): Some Evidence: rat NTPTR*    National Toxicology Program Technical Report Series. (Research Triangle Park, NC 27709) No. NTP-TR-334 ,1988. . Reported in EPA TSCA Inventory. EPA Genetic Toxicology Program.

Questionable carcinogen with experimental tumorigenic data. Experimental reproductive effects. Mutation data reported. Potentially explosive reaction with nitrous acid. When heated to decomposition it emits toxic fumes of NO_x.
Hazard Codes: XnXi
Risk Statements: 36/37/38-68-20/21/22 
R36/37/38: Irritating to eyes, respiratory system and skin
R68: Possible risk of irreversible effects
R20/21/22: Harmful by inhalation, in contact with skin and if swallowed
Safety Statements: 26-36/37-45-36/37/39-36 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice
S36/37: Wear suitable protective clothing and gloves
S45: In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 
S36/37/39: Wear suitable protective clothing, gloves and eye/face protection
S36: Wear suitable protective clothing
RIDADR: 2811
WGK Germany: 2
RTECS: SJ6302500

 2-Amino-5-nitrophenol (CAS NO.121-88-0) is also called as 5-Nitro-2-aminophenol ; Phenol, 2-amino-5-nitro- ; 2-Hydroxy-4-nitroaniline ; 3-Hydroxy-4-aminonitrobenzene ; 3-Nitro-6-aminophenol ; 5-Nitro-2-aminophenol ; Phenol, 2-amino-5-nitro- ; Phenol, 2-amino-5-nitro- (8CI)(9CI) .