Showing structure for methyl 12,19-dihydroxy-7,7,13,18,21-pentamethyl-2-methylidene-5,17-dioxo-6,11,14,16-tetraoxahexacyclo[16.3.1.0³,⁸.0¹⁰,²¹.0¹²,²⁰.0¹⁵,¹⁹]docosa-3,8-diene-20-carboxylate