Showing structure for (1r,2r,5s,6s,7r,10r,11s,15r,18r)-5-acetyl-6,15,18-trihydroxy-12,12-dimethyl-9,17-dioxapentacyclo[8.5.3.0¹,¹¹.0²,⁷.0⁷,¹⁸]octadecan-8-one