Showing structure for (4s,8s,10s)-16-acetyl-2,12-dihydroxy-10-methyl-5,9-dioxapentacyclo[11.8.0.0³,¹¹.0⁴,⁸.0¹⁵,²⁰]henicosa-1,3(11),12,15(20),16,18-hexaene-6,14,21-trione