(-)-Cyclopenin (-)-Cyclopenine 20007-87-8 Cyclopenin Cyclopenine NSC114538 Spiro[3H-1,4-benzodiazepine-3,2'-oxirane]-2,5(1H,4H)-dione, 4-methyl-3'-phenyl- Spiro[3H-1,4-benzodiazepine-3,2'-oxirane]-2,5(1H,4H)-dione, 4-methyl-3'-phenyl-, cis-(-)-