A compound of formula 1 wherein: X? is an anion with a single negative charge; A and B, which are identical or different, are each —O—, —S—, —NH—, —CH2—, —CH═CH—, or —N(C1-C4-alkyl)-; R is hydrogen, hydroxy, —C1-C4-alkyl, —C1-C4-alkyloxy, —C1-C4-alkylene-halogen, —O—C1-C4-alkylene-halogen, —C1-C4-alkylene-OH, —CF3, —CHF2, —C1-C4-alkylene-C1-C4-alkyloxy, —O—COC1-C4-alkyl, —O—COC1-C4-alkylene-halogen, —C1-C4-alkylene-C3-C6-cycloalkyl, —O—COCF3, or halogen; R1 and R2, which are identical or different, are each —C1-C5-alkyl, which is optionally substituted by —C3-C6-cycloalkyl, hydroxy, or halogen, or R1 and R2 together are a —C3-C5-alkylene bridge; R3, R4, R3′, and R4′, which are identical or different, are each hydrogen, C1-C4-alkyl, C1-C4-alkyloxy, hydroxy, —CF3, —CHF2, —CN, —NO2, or halogen; Rx and Rx′, which are identical or different, are each hydrogen, C1-C4-alkyl, C1-C4-alkyloxy, hydroxy, —CF3, —CHF2, —CN, —NO2, or halogen, or Rx and Rx′ together are a single bond or a bridging group selected from —O—, —S—, —NH—, —CH2—, —CH2—CH2—, —N(C1-C4-alkyl)-, —CH(C1-C4-alkyl)-, and —C(C1-C4-alkyl)2-, or a pharmacologically acceptable acid addition salt thereof, processes for preparing, them and their use in pharmaceutical compositions.