Patent ID: 7354936

Claim:
A compound of formula (I): wherein: R 1 represents an alkyl or â€”NR 5 R 6 group, wherein R 5 and R 6 each independently represent a hydrogen atom or an alkyl group; R 2 represents an alkyl, C 3 -C 7 cycloalkyl, pyridyl, thienyl, naphthyl, tetrahydronaphthyl or indanyl group, or a phenyl group which may be unsubstituted or substituted by one or more halogen atoms or alkyl, trifluoromethyl, hydroxy, alkoxy, methylthio, amino, mono- or dialkylamino, hydroxyalkyl or hydroxycarbonyl groups; R 3 represents an alkyl, hydroxymethyl, alkoxymethyl, alkenyloxymethyl, C 3 -C 7 cycloalkoxymethyl, C 3 -C 7 cycloalkylmethoxymethyl, benzyloxymethyl, hydroxycarbonyl, nitrile, trifluoromethyl or difluoromethyl group or a R 7 â€”COOâ€”CH 2 â€” group wherein R 7 represents an alkyl or phenyl group; R 4 represents an alkyl, alkenyl or alkynyl group or a halogen atom; and X represents a single bond, an oxygen atom, a sulfur atom or a methylene group; or a pharmaceutically acceptable salt thereof.