2-Propene-1,2-dicarboxylic acid 50976-31-3 5363-69-9 97-65-4 AI3-16901 Butanedioic acid, methylene- EINECS 202-599-6 HSDB 5308 Itaconic acid METHYLENESUCCINIC ACID Methylenebutanedioic acid NSC 3357 Propylenedicarboxylic acid Succinic acid, methylene- Succinic acid, methylene- (8CI)