| abstract |
A novel pyrazolopyridine derivative is provided which is useful as a pharmaceutical drug having phosphodiesterase inhibitory activity. n The pyrazolopyridine derivative is represented by the following general formula (1): n n n n n n n n n n [wherein R 1 is a hydrogen atom, an optionally substituted alkyl group having 1 to 6 carbon atoms, or the like, R 2 is an optionally substituted alkyl group having 1 to 6 carbon atoms or the like, R 5 and R 6 are independently a hydrogen atom or a halogen atom, R 13 is a hydrogen atom or a halogen atom, n is 0 or 1, n n n n n n n n n n is a single or double bond, R 3 is a hydrogen atom, a hydroxyl group, or the like, and R 4 is a hydrogen atom, a phenyl group, or the like] or a pharmaceutically acceptable salt thereof, and a hydrate thereof. |