IUPAC:(15S,16S,18R)-15-ethyl-11-methyl-17-oxa-1,11-diazapentacyclo[13.4.1.0^{4,12}.0^{5,10}.0^{16,18}]icosa-4(12),5,7,9-tetraene
IUPAC:(15S,16S,18R)-15-ethyl-11-methyl-17-oxa-1,11-diazapentacyclo[13.4.1.0^{4,12}.0^{5,10}.0^{16,18}]icosa-4(12),5,7,9-tetraene