Showing structure for (1s,2r,10r,12r,15r,16r,21r)-15-methyl-6,14-dioxo-8,13,17-trioxahexacyclo[14.2.2.1¹,¹².0²,¹⁰.0⁵,⁹.0¹⁵,²¹]henicos-5(9)-en-16-yl acetate