Showing structure for (1e)-2-[(1r,7r,8s,11r,15s)-1-methoxy-4,8,12,12-tetramethyl-3,13-dioxatetracyclo[6.6.2.0²,⁶.0¹¹,¹⁵]hexadeca-2(6),4-dien-7-yl]ethenyl 3-methylbut-2-enoate