Showing structure for (1s,2s,3s,4r,8s,9r,10s,12z,14s,17r)-2,9-bis(acetyloxy)-4,8,12,17-tetramethyl-5,16-dioxo-15,18-dioxatetracyclo[12.4.0.0¹,¹⁷.0³,⁸]octadeca-6,12-dien-10-yl butanoate