A group of novel N-1-substituted indazole-3-carboxamide derivatives were synthesized and evaluated as inhibitors of poly (ADP-ribose) polymerase-1 (PARP-1). A structure-based design strategy was applied to a weakly active unsubstituted 1H-indazole-3-carboxamide 2, by introducing a three carbon linker between 1H-indazole-3-carboxamide and different heterocycles, and led to compounds 4 [1-(3-(piperidine-1-yl) propyl)-1H-indazole-3- ...