Showing structure for (1r,10r,11r,12s,20s)-6,15,16,17-tetramethoxy-10,11-dimethyl-2,4,19-trioxapentacyclo[10.7.1.0¹,⁵.0⁸,²⁰.0¹³,¹⁸]icosa-5,8,13(18),14,16-pentaen-7-one