Showing structure for (20r)-17,18,20-trimethoxy-21-methyl-5,7-dioxa-21-azapentacyclo[11.8.0.0²,¹⁰.0⁴,⁸.0¹⁴,¹⁹]henicosa-1(13),2,4(8),9,11,14,16,18-octaene