14-hydroxy-7-phenyl-4,10-diazatetracyclo[7.7.0.0^{2,6}.0^{11,16}]hexadeca-1,6,8,11,13,15-hexaene-3,5-dione
9-hydroxy-4-phenyl-1H,2H,3H,6H-pyrrolo[3,4-c]carbazole-1,3-dione
14-hydroxy-7-phenyl-4,10-diazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2(6),7,11(16),12,14-hexaene-3,5-dione