Showing structure for 6-(acetyloxy)-7,11-bis[(acetyloxy)methyl]-5-hydroxy-3,11,14-trimethyl-15-oxotetracyclo[7.5.1.0¹,⁵.0¹⁰,¹²]pentadeca-2,7-dien-4-yl 2-methylbut-2-enoate