Patent ID: 7943624

Claim:
A pyridinylpyrazolopyrimidinone compound represented by the following formula (IA) or (IB): wherein: R 1 is an optionally substituted C 3 -C 8 cycloalkyl group or tert-butyl group; R 2 is a hydrogen atom or C 1 -C 3 alkyl group; R 3 is —NR 5 R 6 , —C(═O)R 7 or —S(O) 0-2 R 8 ; R 4 is a hydrogen atom or C 1 -C 3 alkoxyl group which is optionally substituted by one or more fluorine atom(s); R 5 and R 6 are, same or different from each other, a hydrogen atom, optionally substituted C 1 -C 6 alkyl group, optionally substituted acyl group, optionally substituted heterocycloalkyl group, and optionally substituted heterocycloalkyl ring which is formed with the nitrogen atom binding R 5 and R 6 ; R 7 is —OR 9 or —NR 5 R 6 ; R 8 is a hydrogen atom, a halogen atom, —NR 5 R 6 , unsubstituted C 1 -C 6 alkyl group, or optionally substituted aryl group; R 9 is a hydrogen atom or optionally substituted C 1 -C 6 alkyl group; or pharmaceutically acceptable salts thereof.