Pyrazolo[1,5-a] pyridines and medicines containing the same

A compound represented by the general formula:

• wherein R7a represents hydrogen, nitro, —NO or —NHR7d wherein R7d represents hydrogen, t-butoxycarbonyl or benzyloxycarbonyl;
• R7c represents methylene, oxygen or sulfur;
• and
• R7b represents hydrogen, halogen, the formula:
• wherein R8a and R8b each independently represent hydrogen or C1-6 alkyl, or R8a and R8b optionally bond together to form 1,2-ethylene, 1,3-propylene or 2,3-dimethylbutan-2,3-diyl, the formula:
• wherein R8c, R8d and R8e each independently represent C1-6 alkyl or the formula:
• wherein R40 and R41 each independently represent methoxy, ethoxy, ethyl, dimethylamino, methyl or halogen, R42 represents hydrogen, methoxy, methyl or halogen, and Z1 and Z2 each independently represent methine or nitrogen,
• with the proviso that compounds satisfying the following conditions (1), (2) or (3) are not included in the above definitions:
• (1) R7c is oxygen, R7b is hydrogen and R7a is hydrogen, nitro, —NO or —NH2, (2) R7c is sulfur, R7b is hydrogen and R7a is nitro or —NH2, or (3) R7c is methylene, R7b is hydrogen and R7a is —NO,
• a salt thereof or a hydrate thereof.