Patent ID: 7495002

Claim:
A compound of formula wherein R 1 denotes an arylmethyl or arylethyl group, a heteroarylmethyl or heteroarylethyl group, an arylcarbonylmethyl group, a heteroarylcarbonylmethyl group or an arylprop-2—enyl or heteroarylprop-2−enyl group, wherein the propenyl chain may be substituted by 1 to 4 fluorine atoms or a cyano, C 1-3 -alkyloxy-carbonyl or nitro group, R 2 denotes a C 1-4 -alkyl group, which may be straight-chain or branched, and X denotes a —CH 2 CH 2 group, which may optionally be substituted by one or two C 1-3 -alkyl groups, which may be identical or different, while, unless otherwise stated, the above-mentioned alkyl, alkenyl and alkynyl groups may be straight-chain or branched, or a tautomer or salt thereof.