Showing structure for (2r,3s,4s,8r,9r,11r)-3-(acetyloxy)-2-hydroxy-2-(hydroxymethyl)-11-methyl-7-methylidene-6,12-dioxo-5,14-dioxatricyclo[9.2.1.0⁴,⁸]tetradec-1(13)-en-9-yl 2-methylprop-2-enoate