7-(5-(5,5-dimethylhexa-2,3-dien-1-yl)-2,2-dimethyl-1,3-dioxan-5-yl)hept-5-ynal

((8,8-bis((benzyloxy)methyl)-13,13-dimethyltetradeca-10,11-dien-5-yn-1-yl)oxy)(tert-butyl)dimethylsilane