(1R,2R,5S,6S)-2,4,4,6,8,8-hexamethyl-3,7,9,10-tetraoxatricyclo[4.2.1.1^2,5]decane

ethyl 3-(3,3-dimethyloxiran-2-yl)but-2-enoate

(Z)-4,5-Epoxy-3,5-dimethyl-2-hexensaeure-ethylester