Patent ID: 7160901

Claim:
A compound of the formula I or a pharmaceutically acceptable salt thereof, wherein: X is an oxygen or sulphur atom, R 1 is a hydrogen atom, a C 1-4 -alkoxycarbonyl or C 2-4 -alkanoyl group, R 2 is a C 1-6 -alkyl group optionally substituted by one or more halogen atoms or a phenyl group or a C 2-6 -alkenyl group optionally substituted by a phenyl group, wherein the phenyl moiety may be substituted in each case by a fluorine, chlorine, bromine or iodine atom, by a C 1-3 -alkyl or C 1-3 -alkoxy group, a phenyl group which may be mono- or disubstituted by fluorine, chlorine, bromine or iodine atoms, by C 1-3 -alkyl or C 1-3 -alkoxy groups, wherein the substituents may be identical or different, a phenyl group substituted by a trifluoromethyl, carboxy, C 1-3 -alkoxycarbonyl, aminocarbonyl, cyano, aminomethyl, nitro or amino group, a C 4-6 -alkyl, C 3-7 -cycloalkyl, trimethylphenyl or naphthyl group, R 3 is a hydrogen atom or a C 1-6 -alkyl group, a phenyl group optionally substituted by a fluorine, chlorine or bromine atom, by a C 1-3 -alkyl, hydroxy, C 1-3 -alkoxy, C 1-3 -alkylsulphenyl, C 1-3 -alkylsulphinyl, C 1-3 -alkylsulphonyl, phenylsulphenyl, phenylsulphinyl, phenylsulphonyl, nitro, amino, C 1-3 -alkylamino, di-(C 1-3 -alkyl)-amino, C 2-5 -alkanoylamino or N—(C 1-3 -alkylamino)-C 2-5 -alkanoylamino group, R4 is a phenyl or naphthyl group substituted by R 7 , which may additionally be substituted by a chlorine or bromine atom or a nitro group, R 5 and R 6 in each case independently of one another are hydrogen atoms or C 1-3 -alkyl groups, and R 7 is a C 1-3 -alkyl group which is substituted by a piperidino group, while the abovementioned piperidino group may be substituted by one or two C 1-3 -alkyl groups, which may in turn be terminally substituted by a hydroxy, amino or C 2-4 -alkanoylamino group, or by a C 5-7 -cycloalkyl or phenyl group and by a hydroxy group and in the abovementioned piperidino group a methylene group adjacent to the nitrogen atom may be replaced by a carbonyl group.