Patent ID: 7319107

Claim:
A compound of the formula (I) wherein R 1 is aryl, wherein the aryl is substituted with one or more substituents independently selected from halogen, hydroxy, alkyl, alkoxy; halogenated alkyl, halogenated alkoxy, amino, alkylamino or di(alkyl)amino; R 2 is aryl; wherein the aryl is substituted with one or more substituents independently selected from halogen, hydroxy, alkyl, alkoxy trihalomethyl, trihalomethoxy, amino, alkylamino or di(alkyl)amino; R 3 is hydrogen; R 4 is aryl; wherein the aryl-group is optionally substituted with one or more substituents independently selected from halogen, hydroxy, alkyl, alkoxy; halogenated alkyl, halogenated alkoxy, amino, alkylamino or di(alkyl)amino; and X − is selected from the group consisting of bromide, chloride, iodide, acetate, benzoate, citrate, lactate, malate, nitrate, phosphate, diphosphate, succinate, sulfate, tartrate and tosylate.