A compound selected from the group consisting of: N-[2-Methyl-5-(6-chloro-1H-indole-3-yl sulfonyl)phenyl]-N-(1-methyl piperidin-4-yl)amine; N-[5-(5-Bromo-2-methoxybenzenesulfonyl)-2-methoxyphenyl]-N-(1-methylpiperidin-4-yl)amine hydrochloride; N-(1-Methyl piperidin-4-yl)-N-[3-(6-chloro-1H-indole-3-yl sulfonyl)phenyl]amine hydrochloride; N-(1-Methyl piperidin-4-yl)-N-[3-(5-fluoro-1H-indole-3-yl sulfonyl)phenyl]amine hydrochloride; N-(1-Methyl piperidin-4-yl)-N-[2-chloro-5-(6-chloro-1H-indole-3-yl sulfonyl)phenyl]amine hydrochloride; N-(1-Methyl piperidin-4-yl)-N-[2-methoxy-5-(1H-Indole-3-yl sulfonyl) phenyl]amine; N-(1-Methyl piperidin-4-yl)-N-[2-methoxy-5-(5-methoxy-1H-Indole-3-yl sulfonyl)phenyl]amine; N-(Piperidin-4-yl)-N-[2-methoxy-5-(5-methoxy-1H-Indole-3- yl sulfonyl)phenyl]amine; N-(Piperidin-4-yl)-N-[2-methoxy-5-(6-chloro-1H-Indole-3-yl sulfonyl)phenyl]amine; N-(1-Methyl piperidin-4-yl)-N-[2-methoxy-5-(6-chloro-1H-Indole-3-yl sulfonyl) phenyl]amine; N-[5-(5-Bromo-2-methoxybenzenesulfonyl)-2-methylphenyl]-N-(3-fluoropiperidin-4-yl)amine hydrochloride; N-[5-(5-Bromo-2-methoxybenzenesulfonyl)-2-methylphenyl]-N-(piperidin-4-yl)amine hydrochloride; N-[5-(5-Bromo-2-methoxybenzenesulfonyl)-2-methylphenyl]-N-(-methylpiperidin-4-yl)amine hydrochloride; N-[5-(5-Bromo-2-methoxybenzenesulfonyl)-2-methoxyphenyl]-N-(3-fluoropiperidin-4-yl)amine hydrochloride; N-[5-(5-Bromo-2-methoxybenzenesulfonyl)-2-methoxyphenyl]-N-(piperidin-4-yl)amine hydrochloride; N-[5-(3-Bromo-4-methoxybenzenesulfonyl)-2-methoxyphenyl]-N-(1-methylpiperidin-4-yl)amine tartarate; N-[5-(5-Fluoro-2-methoxybenzenesulfonyl)-2-methoxyphenyl]-N-(1-methylpiperidin-4-yl)amine tartrate; N-[5-(4-Chlorobenzenesulfonyl)-2-methoxyphenyl]-N-(1-methylpiperidin-4-yl)amine tartrate; N-[5-(3-Chloro-4-methoxybenzenesulfonyl)-2-methoxyphenyl]-N-(1-methylpiperidin-4-yl)amine tartrate; and N-(5-Benzenesulfonyl-2-methylphenyl)-N-(1-methylpiperidin-4-yl)amine; and their pharmaceutically acceptable salts. N-[2-Methyl-5-(6-chloro-1H-indole-3-yl sulfonyl)phenyl]-N-(1-methyl piperidin-4-yl)amine; N-[5-(5-Bromo-2-methoxybenzenesulfonyl)-2-methoxyphenyl]-N-(1-methylpiperidin-4-yl)amine hydrochloride; N-(1-Methyl piperidin-4-yl)-N-[3-(6-chloro-1H-indole-3-yl sulfonyl)phenyl]amine hydrochloride; N-(1-Methyl piperidin-4-yl)-N-[3-(5-fluoro-1H-indole-3-yl sulfonyl)phenyl]amine hydrochloride; N-(1-Methyl piperidin-4-yl)-N-[2-chloro-5-(6-chloro-1H-indole-3-yl sulfonyl)phenyl]amine hydrochloride; N-(1-Methyl piperidin-4-yl)-N-[2-methoxy-5-(1H-Indole-3-yl sulfonyl) phenyl]amine; N-(1-Methyl piperidin-4-yl)-N-[2-methoxy-5-(5-methoxy-1H-Indole-3-yl sulfonyl)phenyl]amine; N-(Piperidin-4-yl)-N-[2-methoxy-5-(5-methoxy-1H-Indole-3- yl sulfonyl)phenyl]amine; N-(Piperidin-4-yl)-N-[2-methoxy-5-(6-chloro-1H-Indole-3-yl sulfonyl)phenyl]amine; N-(1-Methyl piperidin-4-yl)-N-[2-methoxy-5-(6-chloro-1H-Indole-3-yl sulfonyl) phenyl]amine; N-[5-(5-Bromo-2-methoxybenzenesulfonyl)-2-methylphenyl]-N-(3-fluoropiperidin-4-yl)amine hydrochloride; N-[5-(5-Bromo-2-methoxybenzenesulfonyl)-2-methylphenyl]-N-(piperidin-4-yl)amine hydrochloride; N-[5-(5-Bromo-2-methoxybenzenesulfonyl)-2-methylphenyl]-N-(-methylpiperidin-4-yl)amine hydrochloride; N-[5-(5-Bromo-2-methoxybenzenesulfonyl)-2-methoxyphenyl]-N-(3-fluoropiperidin-4-yl)amine hydrochloride; N-[5-(5-Bromo-2-methoxybenzenesulfonyl)-2-methoxyphenyl]-N-(piperidin-4-yl)amine hydrochloride; N-[5-(3-Bromo-4-methoxybenzenesulfonyl)-2-methoxyphenyl]-N-(1-methylpiperidin-4-yl)amine tartarate; N-[5-(5-Fluoro-2-methoxybenzenesulfonyl)-2-methoxyphenyl]-N-(1-methylpiperidin-4-yl)amine tartrate; N-[5-(4-Chlorobenzenesulfonyl)-2-methoxyphenyl]-N-(1-methylpiperidin-4-yl)amine tartrate; N-[5-(3-Chloro-4-methoxybenzenesulfonyl)-2-methoxyphenyl]-N-(1-methylpiperidin-4-yl)amine tartrate; and N-(5-Benzenesulfonyl-2-methylphenyl)-N-(1-methylpiperidin-4-yl)amine; and their pharmaceutically acceptable salts.