Melting point :200-202 °C(lit.)
Boiling point :bp 250° (decompn)
Density :1.466
refractive index :1.4240 (estimate)
storage temp. :2-8°C
solubility :DMSO (Slightly), Methanol (Slightly)
form :Solid
pka :3.09(at 25℃)
color :White to Off-White
PH :3.23(1 mM solution);2.61(10 mM solution);2.06(100 mM solution)
Water Solubility :26.3g/L(18 ºC)
Merck :5903
BRN :1722680
InChI :1S/C5H6O4/c1-3(5(8)9)2-4(6)7/h2H,1H3,(H,6,7)(H,8,9)/b3-2+
InChIKey :HNEGQIOMVPPMNR-NSCUHMNNSA-N
SMILES :C\C(=C/C(O)=O)C(O)=O
LogP :0.540 (est)
CAS DataBase Reference :498-24-8(CAS DataBase Reference)
NIST Chemistry Reference :2-Butenedioic acid, 2-methyl-, (E)-(498-24-8)
EPA Substance Registry System :2-Butenedioic acid, 2-methyl-, (2E)- (498-24-8)

Symbol(GHS):
Signal word:	Warning
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 H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning
Precautionary statements:	P264 Wash hands thoroughly after handling. P264 Wash skin thouroughly after handling. 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. P321 Specific treatment (see … on this label). P332+P313 IF SKIN irritation occurs: Get medical advice/attention. P362 Take off contaminated clothing and wash before reuse.