| abstract |
A compound of formula (I) ** Formula ** in which R1 is hydrogen, fluoro, methyl or ethyl, R2 is methyl, difluoromethyl or trifluoromethyl, R3 is hydrogen or fluoro, R4 is hydrogen, methyl or ethyl, and R5 is hydrogen or methyl, or a pharmaceutically acceptable salt, hydrate and / or solvate thereof. |