The present inventors have investigated a compound which has a PDE9-inhibiting action and is useful as an active ingredient for an agent for treating and/or preventing storage dysfunction, voiding dysfunction, bladder/urethral diseases, and the like, and thus, have found that a pyrazoloquinoline compound has a PDE9-inhibiting action, thereby completing the present invention.
capitalizing on methyl- or ethyl-substituted piperizine ring to capture the characteristics of adenine-ribose binding site (AD site), and their unique binding features were revealed by the cocrystal structures of compounds 4 and 6 in PARP-1. The investigation on structure–activity relationship resulted in compounds 24 and 32 with high enzymatic potency, binding selectivity, and significantly longer residence