Showing structure for 13-hydroxy-5-(hydroxymethyl)-2,11,12-trimethyl-6-oxo-7,17-dioxapentacyclo[10.3.1.1³,¹⁵.0⁵,¹⁵.0⁸,¹³]heptadec-1-en-16-yl 2-methylprop-2-enoate