| abstract |
Provided is a compound represented by general formula (6) and pharmaceutically acceptable salts thereof. (In the formula, R 1 is a hydrogen atom or a C 1-6 alkyl group; R 2 is a hydrogen atom or a C 1-6 alkyl group; R 3 is a hydrogen atom, a halogen atom, a C 1-6 alkyl group, or a C 1-6 haloalkyl group.) |