Showing structure for 18-methoxy-5,7-dioxa-21-azapentacyclo[11.8.0.0²,¹⁰.0⁴,⁸.0¹⁴,¹⁹]henicosa-1(13),2(10),3,8,11,14(19),15,17,20-nonaen-17-yl acetate