4-oxa-1-azabicyclo [3,2,0] heptan-7-one derivatives as antitumor

4-oxo- and 4H-imidazo(5,1-c)(1,4)benzoxazines useful as benzodia

4-oxo-1,2,3-benzotriazines

4-oxo-1,4-dihydro[1,8]naphthyridine-3-carboxamides...

4-oxo-1,4-dihydro[1,8]naphthyridine-3-carboxamides...

4-oxo-1,4-dihydro-3-cinnolinecarboxamides as antiviral agents

4-oxo-1,4-dihydro-3-quinolinecarboxamides as antiviral agents

4-oxo-1,4-dihydronicotinic acid derivatives, salts thereof, and

4-oxo-1,4-dihydroquinoline-3-carboxylic acid derivative as antib

4-oxo-1-(3-substituted...

4-Oxo-1-3-substituted...

4-oxo-2,3,4,5-tetrahydro-benzo[b][1,4]diazepine derivatives

4-oxo-3,4-dihydro-2H-1-benzopyranyloxy alkanoic acid derivatives

4-Oxo-3,5-dihydro-4H-pyridazino[4,5-b]-indole-1-ac...

4-oxo-3,5-dihydro-4H-pyridazino[4,5-b]indole-1-car...

4-oxo-4,7-dihydro-thieno[2,3-b]pyridine-5carboxami...

4-oxo-4,7-dihydrofuro[2,3-b]pyridine-5-carboxamide antiviral...

4-Oxo-4,7-dihydrothieno[2,3-b]pyridine-5-carboxami...

4-Oxo-4h-quinolizine-3-carboxylic acids and derivatives thereof

4-oxo-azetidine-2-sulfonic acids and their salts, processes for