Showing structure for 4,5-dimethyl 7,8-dimethoxy-20-oxo-5,15-diazahexacyclo[11.5.2.1¹,¹².0⁴,¹².0⁶,¹¹.0¹⁵,²¹]henicosa-6(11),7,9-triene-4,5-dicarboxylate