1,2-Epoxy-4-cyclohexene 1,2-Epoxyucyclohex-4-ene 1,4-Cyclohexadiene 1,2-oxide 4,5-Epoxycyclohexene 6253-27-6 7-Oxabicyclo(4.1.0)hept-3-ene Cyclohexa-1,4-diene oxide Cyclohexene, 4,5-epoxy- Cyclohexene-4,5-epoxide NSC 116459 NSC 196239