Showing structure for (1s,6s,8s,9r,12s,13r)-4-[(acetyloxy)methyl]-12-hydroxy-8,12-dimethyl-3-oxo-2-oxatetracyclo[6.5.0.0¹,⁵.0⁹,¹³]tridec-4-en-6-yl (2e)-2-methylbut-2-enoate