Showing structure for 17,18,22-trimethoxy-7,7-dimethyl-2,8,21-trioxapentacyclo[12.8.0.0³,¹².0⁴,⁹.0¹⁵,²⁰]docosa-1(14),3,5,9,11,15(20),16,18-octaen-13-one