2,6-Octadienoic acid, 3,7-dimethyl-, ethyl ester

ethyl 5-methyl-2-prop-1-en-2-ylhex-4-enoate

ethyl 3,3-dimethyl-2-(prop-1-en-2-yl)pent-4-enoate

2-Isopropenyl-3,3-dimethyl-2-trimethylsilanyl-pent-4-enoic acid ethyl ester