Showing structure for 21-amino-15,19-dimethyl-4-oxa-14-azahexacyclo[14.4.1.0²,⁷.0⁸,²⁰.0¹²,¹⁹.0¹⁴,¹⁸]henicosa-1(21),2(7),8(20)-triene-3,9-dione