1-oxo-11,2'-(4''-methylpiperazin-1''-yl)acetyl-5,11-dihydro-6H-pyrido<2,3-b><1,4>benzodiazepin-6-one
1-oxo-5,11-dihydro-11-imidazol-1'-ylacetyl-6H-pyrido<2,3-b><1,4>benzodiazepin-6-one
pirenzepine
5,11-dihydro-11-<(2'-methylimidazo-1'-yl)-acetyl>-6H-pyrido<2,3-b><1,4>benzodiazepin-6-one
5,11-dihydro-11-<(imidazo-1'-yl)-acetyl>-6H-pyrido<2,3-b><1,4>benzodiazepin-6-one