| 摘要 |
A pharmaceutical composition comprising a compound represented by the formula (I) or pharmaceutically acceptable salt thereof or solvate thereof; and a basic substance is excellent in dissolution, is stable even after a long term storage, and is useful as a preventive or therapeutic agent against a tumor:
wherein, R 1 is a hydrogen atom, a C 1-6 alkyl group or a C 3-8 cycloalkyl group; and R 2 is a hydrogen atom or a methoxy group.
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