Molecular Formula: C₁₈H₂₆O₄
Molar mass: 306.3966 g/mol
EINECS: 205-017-9
Density: 1.03 g/cm³
Flash Point: 188.8 °C
Index of Refraction: 1.496
Boiling Point: 357 °C at 760 mmHg
Vapour Pressure: 2.8E-05 mmHg at 25°C
Melting point: -55 °C
Appearance: Clear colorless to light yellow liquid
Structure of Amyl phthalate (131-18-0):

XLogP3-AA: 5.8
H-Bond Donor: 0
H-Bond Acceptor: 4
Systematic Name: Dipentyl benzene-1,2-dicarboxylate 
SMILES: O=C(OCCCCC)c1ccccc1C(=O)OCCCCC 
InChI: InChI=1/C18H26O4/c1-3-5-9-13-21-17(19)15-11-7-8-12-16(15)18(20)22-14-10-6-4-2/h7-8,11-12H,3-6,9-10,13-14H2,1-2H3 
InChIKey: IPKKHRVROFYTEK-UHFFFAOYAE 
Std. InChI: InChI=1S/C18H26O4/c1-3-5-9-13-21-17(19)15-11-7-8-12-16(15)18(20)22-14-10-6-4-2/h7-8,11-12H,3-6,9-10,13-14H2,1-2H3 
Std. InChIKey: IPKKHRVROFYTEK-UHFFFAOYSA-N

 Amyl phthalate (131-18-0) has been used as teratogen.

Carcinogenicity of Amyl phthalate (131-18-0) hasn't been listed as a carcinogen by NTP, IARC,ACGIH, or CA Prop 65.

Reported in EPA TSCA Inventory.

Experimental reproductive effects. When heated to decomposition it emits acrid smoke and irritating fumes.
 

Hazard Codes: T,N
Risk Statements:
50:  Very Toxic to aquatic organisms
60:  May impair fertility
61:  May cause harm to the unborn child
Safety Statements:
45:  In case of accident or if you feel unwell, seek medical advice immediately (show label where possible)
53:  Avoid exposure - obtain special instruction before use
61:  Avoid release to the environment. Refer to special instructions safety data sheet

 Amyl phthalate (131-18-0) also can be called Di-n-pentyl phthalate ; Phthalic acid, dipentyl ester ; Phthalic acid, diamyl ester ; Di-n-pentylphthalate ; Dipentyl 1,2-benzenedicarboxylate and Dipentyl phthalate .It is an ester. Esters react with acids to liberate heat along with alcohols and acids. Strong oxidizing acids may cause a vigorous reaction that is sufficiently exothermic to ignite the reaction products.It is hazardous,so the first aid measures and others should be known.Such as: When on the skin: first,should  flush skin with plenty of water immediatelyfor at least 15 minutes while removing contaminated clothing. Secondly,Get shoesmedical aid . Or in the eyes: Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids.Then get medical aid soon.While ,it's Inhaled: Remove from exposure and move to fresh air immediately.Give artificial respiration while not breathing. When breathing is difficult, give oxygen. And as soon as to get medical aid. Then you have the ingesting of the product : Wash mouth out with water,and get medical aid immediately.
In addition, Amyl phthalate (131-18-0) is not compatible with strong oxidizing agents, and you must not take it with incompatible materials.And also prevent it to broken down into hazardous decomposition products: carbon dioxide, carbon monoxide.