Showing structure for methyl (1r,2s,3s,6r,7s,13r)-6-ethenyl-10-methoxy-2,6-dimethyl-8,15-dioxo-9,14-dioxatetracyclo[10.3.1.0³,¹³.0⁷,¹³]hexadeca-10,12(16)-diene-2-carboxylate