Patent ID: 7153853

Claim:
A heterocyclic compound represented by the formula I or a pharmaceutically acceptable salt thereof: wherein X represents a nitrogen atom or CH; R 1 represents a halogen atom or hydroxyl; R 2 represents a hydrogen atom, hydroxyl or amino; R 3 represents morpholino (which may be substituted with one or two C 1 –C 6 alkyl), pyrrolidinyl (which may be substituted with hydroxy C 1 –C 6 alkyl), or NR 6 R 7 [wherein R 6 represents C 1 –C 6 alkyl and R 7 represents piperidinyl (which may be substituted with C 1 –C 6 alkyl)]; R 4 and R 5 each independently represent a hydrogen atom or C 1 –C 6 alkyl; with the proviso that R 2 is hydrogen atom and R 3 is pyrrolidinyl (which may be substituted with hydroxy C 1 –C 6 alkyl) when R 1 is hydroxyl.