114642-66-9 2-BUTENEDIOIC ACID, (E)-, MONOMETHYL ESTER, 2-((4-CARBOXYPHENYL)SULFONYL)HYDRAZI 2-Butenedioic acid, (E)-, monomethyl ester, 2-((4-carboxyphenyl)sulfonyl)hydrazide Monomethyl (E)-2-butenedioate 2-((4-carboxyphenyl)sulfonyl)hydrazide