white to yellow-beige crystals or crystalline powder
Specification:
4-Methoxy-3-pyrrolin-2-one , its CAS NO. is 69778-83-2, the synonyms are 2H-Pyrrol-2-one, 1,5-dihydro-4-methoxy- ; 1H-2-Pyrrolone, 4-methoxy-2,5-dihydro ; 4-Methoxy-1,5-dihydro-2H-pyrrol-2-one .