Patent ID: 8492548

Claim:
A compound of formula (I): wherein: R 1 is aryl optionally substituted by one or more substituents selected from the group consisting of a halogen atom and —COOH; R 2 is aryl optionally substituted by one or more halogen atoms; W is either: (1) aryl which is substituted by one or more substituents, the same or different, selected from the group consisting of iodo, —CN, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, pentyl, hexyl, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, sec-butoxy, tert-butoxy, pentoxy, hexoxy, (C 1 -C 6 )haloalkyl, (C 1 -C 6 )haloalkoxy, (C 3 -C 8 )cycloalkyl, heterocyclyl, aryl, aryloxy, haloaryl, (C 1 -C 6 )alkyl-NCO—(C 1 -C 6 )alkyl, —SR 3 , —OSO 2 R 3 , —COR 3 , —CO 2 H, —OCOR 3 , —CON(R 3 ) 2 , —NHCO 2 R 3 , —NHSO 2 R 3 , —NHCO—(C 1 -C 6 )alkyl-COOH, —CO 2 —(C 1 -C 6 )alkyl-N(R 3 ) 2 and —CO-heterocyclyl; or (2) heteroaryl which is substituted by one or more substituents, the same or different, selected from the group consisting of fluoro, bromo, iodo, —NO 2 , —CN, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, pentyl, hexyl, (C 1 -C 6 )alkoxy, (C 1 -C 6 )haloalkyl, (C 1 -C 6 )haloalkoxy, (C 3 -C 8 )cycloalkyl, heterocyclyl, aryl, aryloxy, haloaryl, (C 1 -C 6 )alkyl-NCO—(C 1 -C 6 )alkyl, —OR 3 , —N(R 3 ) 2 , —SR 3 , —OSO 2 R 3 , —COR 3 , —OCOR 3 , —CON(R 3 ) 2 , —NHCOR 3 , —NHCO 2 R 3 , —NHSO 2 R 3 , —NHCO—(C 1 -C 6 )alkyl-COOH, —CO 2 —(C 1 -C 6 )alkyl-N(R 3 ) 2 and —CO-heterocyclyl; R 3 is H or (C 1 -C 6 )alkyl; and A − is a physiologically acceptable anion; or a pharmaceutically acceptable salt thereof.