Showing structure for methyl (2e)-3-[(4r,6r,8r,9s,10r,14s,17r,19r)-17-(acetyloxy)-8,9,10,14,18,18-hexamethyl-5-oxapentacyclo[11.8.0.0²,¹⁰.0⁴,⁹.0¹⁴,¹⁹]henicosa-1(13),2-dien-6-yl]-2-methylprop-2-enoate