A compound of formula and pharmaceutically acceptable salt thereof for use in the treatment of hypertension: wherein: R 1 represents 3-trifluoromethylphenyl, A represents N, B represents CH, X is N, R 2 represents H and Y represents butylene, i.e., compound 1-2: 1-(4-(4-(3-trifluoromethylphenyl)piperazin-1-yl)butyl)-1H-benzimidazole, or R 1 represents 2,3-dichlorophenyl, A represents N, B represents CH, X is N, R 2 represents H and Y represents butylene, i.e., compound 1-3: 1-(4-(4-(2,3-dichlorophenyl)piperazin-1-yl)butyl)-1H-benzimidazole, or R 1 represents 3-chlorophenyl, A represents N, B represents N, X is N, R 2 represents H and Y represents butylene, i.e., compound I-29: 1-(4-(4-(3-chlorophenyl)piperazin-1-yl)butyl)-1H-benzotriazole, or R 1 represents 3-trifluoromethylphenyl, A represents N, B represents N, X is N, R 2 represents H and Y represents butylene, i.e., compound 1-31: 1-(4-(4-(3-trifluoromethylphenyl)piperazin-1-yl)butyl)-1H-benzotriazole, or R 1 represents benzisothiazol-3-yl, A represents N, B represents N, X is N, R 2 represents H and Y represents butylene, i.e., compound 1-34: 3-(4-(4-(1H-benzotriazol-1-yl)butyl)piperazin-1-yl)benzisothiazole, or R 1 represents 6-fluorobenzisoxazol-3-yl, A represents N, B represents N, X is CH, R 2 represents H and Y represents propylene, i.e., compound 1-85: N-(3-(1H-benzotriazol-1-yl)propyl)-4-(3-(6-fluorobenzisoxazolyl))piperidine, or R 1 represents 3-trifluoromethylphenyl, A represents N, B represents CH, X is CH, R 2 represents H and Y represents butylene, i.e., compound 1-109: N-(4-(1H-benzimidazol-1-yl)butyl)-4-(3 -trifluoromethylphenyl)piperidine, or R 1 represents 3-trifluoromethylphenyl, A represents N, B represents N, X is CH, R 2 represents H and Y represents butylene, i.e., compound I-110: N-(4-(1H-benzotriazol-1-yl)butyl)-4-(3-trifluoromethylphenyl)piperidine. R 1 represents 3-trifluoromethylphenyl, A represents N, B represents CH, X is N, R 2 represents H and Y represents butylene, i.e., compound 1-2: 1-(4-(4-(3-trifluoromethylphenyl)piperazin-1-yl)butyl)-1H-benzimidazole, or R 1 represents 2,3-dichlorophenyl, A represents N, B represents CH, X is N, R 2 represents H and Y represents butylene, i.e., compound 1-3: 1-(4-(4-(2,3-dichlorophenyl)piperazin-1-yl)butyl)-1H-benzimidazole, or R 1 represents 3-chlorophenyl, A represents N, B represents N, X is N, R 2 represents H and Y represents butylene, i.e., compound I-29: 1-(4-(4-(3-chlorophenyl)piperazin-1-yl)butyl)-1H-benzotriazole, or R 1 represents 3-trifluoromethylphenyl, A represents N, B represents N, X is N, R 2 represents H and Y represents butylene, i.e., compound 1-31: 1-(4-(4-(3-trifluoromethylphenyl)piperazin-1-yl)butyl)-1H-benzotriazole, or R 1 represents benzisothiazol-3-yl, A represents N, B represents N, X is N, R 2 represents H and Y represents butylene, i.e., compound 1-34: 3-(4-(4-(1H-benzotriazol-1-yl)butyl)piperazin-1-yl)benzisothiazole, or R 1 represents 6-fluorobenzisoxazol-3-yl, A represents N, B represents N, X is CH, R 2 represents H and Y represents propylene, i.e., compound 1-85: N-(3-(1H-benzotriazol-1-yl)propyl)-4-(3-(6-fluorobenzisoxazolyl))piperidine, or R 1 represents 3-trifluoromethylphenyl, A represents N, B represents CH, X is CH, R 2 represents H and Y represents butylene, i.e., compound 1-109: N-(4-(1H-benzimidazol-1-yl)butyl)-4-(3 -trifluoromethylphenyl)piperidine, or R 1 represents 3-trifluoromethylphenyl, A represents N, B represents N, X is CH, R 2 represents H and Y represents butylene, i.e., compound I-110: N-(4-(1H-benzotriazol-1-yl)butyl)-4-(3-trifluoromethylphenyl)piperidine.