Showing structure for {17,18-dimethoxy-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-octaen-20-yl}acetic acid