4-Amino-1,3-diazabicyclo(3.1.0)hex-3-en-2-one 4-Imino-1,3-diazabicyclo(3.1.0)hexan-2-one 59643-91-3 BM 06002 EINECS 261-838-2 Imexon Imexon [INN] Imexonum [INN-Latin] NSC 313425