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 Cyclohexene, 4,5-epoxy- NSC196239