Patent ID: 8034966

Claim:
A compound of the formula: wherein R 1 is selected from hydrogen and a pharmaceutically acceptable cation; R 2 and R 3 are independently selected from hydrogen and lower alkyl of 1 to 5 carbon atoms; R 4 is —CO—NH(R 6 ) n NH—CO—, —CO—NH(R 6 ) n —CO—, —CO—NH(R 6 ) n —, —CO—(R 6 ) n —CO—, or —(R 6 ) n , wherein R 6 is phenylene, or a straight, branched or cyclic alkyl with 1 to 6 carbon atoms and n is a whole integer from 1 to 4; R 5 is independently selected from phenylene; mono-, di-, and tri-alkyl or haloalkyl phenylene of 1 to 5 carbon atoms; mono-, di- and tri halophenylene; phenylene-CH 2 -phenylene or a phenoxyisobutyric acid derivative of the formula; wherein R 1 , R 2 and R 3 are as previously defined and R 7 is hydrogen, lower alkyl of 1-4 carbon atoms or R 4 when both R 5 moieties are the phenoxyisobutyric acid derivatives.