butyl 3-hydroxy-3,4-dimethyl-5-(2,6,6-trimethyl-2-cyclohexen-1-yl)pent-4-en-1-oate

3-Hydroxy-3,4-dimethyl-5-(2,6,6-trimethyl-2-cyclohexen-1-yl)-4-pentenoic acid butyl ester