| abstract |
PROBLEM TO BE SOLVED: To provide a novel pyrazolopyridine derivative useful as a pharmaceutical having a phosphodiesterase inhibitory action. The following general formula (1): wherein R1 represents a hydrogen atom, an optionally substituted alkyl group having 1 to 6 carbon atoms, or the like, and R2 represents an optionally substituted carbon. R 5 and R 6 are the same or different and each represents a hydrogen atom or a halogen atom; R 13 represents a hydrogen atom or a halogen atom; n represents 0 or 1; A single bond or a double bond, R3 represents a hydrogen atom or a hydroxyl group, and R4 represents a hydrogen atom or a phenyl group], a pharmacologically acceptable salt thereof, or a Hydrate. [Selection figure] None |