141257-20-7 2,5-Furandione, dihydro-3-methylene- 2170-03-8 Dihydro-3-methylene-2,5-furandione EINECS 218-518-2 Itaconic acid anhydride Itaconic anhydride Methylenesuccinic anhydride NSC 43979 Succinic anhydride, methylene-