Melting point :200-202 °C(lit.)
Boiling point :288.82°C (rough estimate)
Density :1.3264 (rough estimate)
refractive index :1.5770 (estimate)
storage temp. :Keep in dark place,Sealed in dry,Room Temperature
solubility :Solubility in hot methanol almost transparent.
pka :-1.73±0.20(Predicted)
form :powder to crystal
color :White to Light yellow
BRN :383756
InChI :InChI=1S/C8H6N2O2/c9-10-7(11)5-3-1-2-4-6(5)8(10)12/h1-4H,9H2
InChIKey :KSILMCDYDAKOJD-UHFFFAOYSA-N
SMILES :C1(=O)C2=C(C=CC=C2)C(=O)N1N
CAS DataBase Reference :1875-48-5(CAS DataBase Reference)

Symbol(GHS):
Signal word:	Danger
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362 H317 May cause an allergic skin reaction Sensitisation, Skin Category 1 Warning P261, P272, P280, P302+P352,P333+P313, P321, P363, P501 H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P H334 May cause allergy or asthma symptoms or breathing difficulties if inhaled Sensitisation, respiratory Category 1 Danger P261, P285, P304+P341, P342+P311,P501 H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning
Precautionary statements:	P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash hands thoroughly after handling. P264 Wash skin thouroughly after handling. P271 Use only outdoors or in a well-ventilated area. P280 Wear protective gloves/protective clothing/eye protection/face protection. P302+P352 IF ON SKIN: wash with plenty of soap and water. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.