Patent ID: 8106212

Claim:
A compound of formula (I) in which A represents a pyrimidinyl, pyrazolyl, thiophenyl, 1,2,4-oxadiazolyl, isothiazolyl, 1,2,4-triazolyl or 1,2,5-thiadiazolyl radical which is optionally substituted by fluorine, chlorine, bromine, cyano, nitro, C 1 -C 4 -alkyl which is optionally substituted by fluorine and/or chlorine, C 1 -C 3 -alkylthio which is optionally substituted by fluorine and/or chlorine, or C 1 -C 3 -alkylsulphonyl which is optionally substituted by fluorine and/or chlorine; B represents oxygen, sulphur or methylene, R 1 represents hydrogen, alkyl, alkenyl, alkynyl, cycloalkyl or alkoxy, R 2 represents hydrogen or halogen and R 3 represents hydrogen or alkyl.