1H-Pyrrole-2,5-dione 3-Pyrroline-2,5-dione 42867-30-1 5-21-10-00003 (Beilstein Handbook Reference) 541-59-3 67859-67-0 AI3-61139 BRN 0106910 CCRIS 3408 EINECS 208-787-4 MALEIMIDE Maleic imide Maleinimide NSC 13684 Pyrrole-2,5-dione