Patent ID: 8563586

Claim:
A compound of formula I, wherein R is H, halogen; X is alkyl, alkenyl, —(CH 2 ) v COOR 1 or CH═CH—(CH 2 ) v COOR 1 , where v is 0 to 10; or R and X are linked so as to form a fused benzimidazole; R 1 is H, alkyl, aralkyl, trityl, halogen, haloalkyl, cycloalkyl, alkenyl, alkynyl, alkoxyalkyl, haloalkoxyalkyl, alkoxy, aryloxy alkoxyalkoxy, cyano, hydroxy, hydroxyalkyl, nitro, tetrazolyl, oxadiazolyl, triazolyl, OCH(CH 3 )—OCOO-cyclohexyl, cycloanhydride or methyl-5-methyl-[1,3]-dioxolane; Y is H, CH 2 O-alkyl, CH 2 S-alkyl, CH 2 -halogen, CH 2 OH, CH 2 SH, CHO, COOH or halogen; W 1 and W 2 are each independently —(CH 2 ) n —K—Z—Z 1 , where n is 1 to 5; K is biphenyl or monophenyl; Z is tetrazolyl or COO—; Z 1 is H, trityl, halotrityl, CH 2 Ph, COOH, COO-alkyl or CH(Ph) 2 , wherein each Ph group is optionally substituted by one or more halogens; and E is an anion; or a pharmaceutically acceptable salt thereof.