13-Oxabicyclo(10.1.0)trideca-4,8-diene, trimethyl- 71735-79-0 EINECS 275-967-7 Trimethyl-13-oxabicyclo(10.1.0)trideca-4,8-diene Trimethylcyclododeca-5,9-diene-1,2-epoxide