14-nitro-8,18-diazatetracyclo[9.7.0.0^{2,7}.0^{12,17}]octadeca-1(11),2(7),3,5,12,14,16-heptaen-9-one
14-nitro-8,18-diazatetracyclo[9.7.0.02,7.012,17]octadeca-1(11),2,4,6,12,14,16-heptaen-9-one
14-nitro-8,18-diazatetracyclo[9.7.0.0²,⁷.0¹²,¹⁷]octadeca-1(11),2,4,6,12,14,16-heptaen-9-one