97%
144-145 °C (lit.)
COC(=O)\C=C\C(O)=O
1S/C5H6O4/c1-9-5(8)3-2-4(6)7/h2-3H,1H3,(H,6,7)/b3-2+
NKHAVTQWNUWKEO-NSCUHMNNSA-N
Warning
Eye Irrit. 2
11 - Combustible Solids