abstract |
PROBLEM TO BE SOLVED: To provide a novel halogenopyrazolopyridine pyridazinone derivative useful as a pharmaceutical having phosphodiesterase inhibitory action. The following general formula (1) [Chemical 1] A halogenopyrazolopyridine pyridazinone derivative represented by the formula (specific example: 6- (6-chloro-2-ethyl-pyrazolo [1,5-a] pyridin-3-yl) -5-methyl-4,5- Dihydro-3 (2H) -pyridazinone). [Selection figure] None |