Patent ID: 7094788

Claim:
A compound of the formula 1 wherein: X − denotes an anion with a single negative charge; A and B denote —CH═CH—; R denotes hydrogen, hydroxy, —C 1 –C 4 -alkyl, —C 1 –C 4 -alkyloxy, —C 1 –C 4 -alkylene-halogen, —O—C 1 –C 4 -alkylene-halogen, —C 1 –C 4 -alkylene-OH, —CF 3 , CHF 2 , —C 1 –C 4 -alkylene-C 1 –C 4 -alkyloxy, —O—COC 1 –C 4 -alkyl, —O—COC 1 –C 4 -alkylene-halogen, —C 1 –C 4 -alkylene-C 3 –C 6 -cycloalkyl, —O—COCF 3 or halogen; R 1 and R 2 which may be identical or different denote —C 1 –C 5 -alkyl, which may optionally be substituted by —C 3 –C 6 -cycloalkyl, hydroxy or halogen, or R 1 and R 2 together denote a —C 3 –C 5 -alkylene-bridge; R 3 , R 4 , R 3 ′ and R 4 ′, which may be identical or different denote hydrogen, C 1 –C 4 -alkyl, C 1 –C 4 -alkyloxy, hydroxy, —CF 3 , —CHF 2 , CN, NO 2 or halogen; and R x and R x ′ which may be identical or different denote hydrogen, C 1 –C 4 -alkyl, C 1 –C 4 -alkyloxy, hydroxy, —CF 3 , —CHF 2 , CN, NO 2 or halogen or R x and R x ′ together denote a single bond or a bridging group selected from the class of bridges consisting of —O—, —S—, —NH—, —CH 2 —, —CH 2 —CH 2 —, —N(C 1 –C 4 -alkyl)-, —CH(C 1 –C 4 -alkyl)- and —C(C 1 –C 4 -alkyl) 2 -; or an acid addition salt thereof.