(-)-Cyclopenin (-)-Cyclopenine 20007-87-8 4-Methyl-3'-phenylspiro(3H-1,4-benzodiazepine-3,2'-oxirane)-2,5(1H,4H)-dione Cyclopenin Cyclopenine (8CI) NSC 114538 Spiro(3H-1,4-benzodiazepine-3,2'-oxirane)-2,5(1H,4H)-dione, 4-methyl-3'-phenyl-, cis-(-)- (9CI)