Showing structure for methyl 3-[7-(furan-3-yl)-18-hydroxy-1,8,15,15-tetramethyl-5,17-dioxo-3,6,14-trioxapentacyclo[9.7.0.0²,⁴.0²,⁸.0¹²,¹⁶]octadecan-12-yl]prop-2-enoate