| abstract |
Compound of formula ** (See formula) ** in which R1 means 2-methylprop-1-yl, 2,2-dimethylprop-1-yl, 1-trimethylsilylmethyl or 3-pyridylmethyl, and 3-pyridylmethyl may be substituted with a trifluoromethyl substituent, R2 means 2-methylprop-1-yl, 2,2-dimethylprop-1-yl, 2,2-dimethylbut-1-yl, 2-ethyl-2-methylbut-1-yl, 2,2-diethylbut -1- yl, 2,2-dimethylpent-1-yl or 1-trimethylsilylmethyl, R3 means C1-C6 alkyl, and alkyl may be substituted with 1 to 3 substituents, the substituents being independently selected from each other from the group consisting of hydroxy, amino, hydroxycarbonyl, aminocarbonyl, {[bis (dimethylamino) methylene] amino} ethoxy, phenyl, 5- or 6-membered heterocyclyl, 5 or 6-membered heteroaryl, benzyloxycarbonyl and benzyloxycarbonylamino, R4 means hydrogen, C1-C4 alkyl, cyclopropyl or cyclopropylmethyl, R5 means hydrogen or methyl, or one of its salts, its solvates or the solvates of its salts. |