1-Methyl-4-(1-methylvinyl)-7-oxabicyclo(4.1.0)heptan-2-one 33204-74-9 7-Oxabicyclo(4.1.0)heptan-2-one, 1-methyl-4-(1-methylethenyl)- DELTA.8-p-Menthenyl-1,6-epoxy-2-one EINECS 251-405-6