abstract |
A compound selected from the group consisting of a compound of formula I or formula II: (I) (II) wherein n is 3 or 4 wherein Cx is selected from the group consisting of -COOM, COOR6, -CHO, -CH2OR7, -CH2OCOR8, -CONHR9 and -CONR10R11, wherein M is an alkali metal or alkaline earth metal, wherein R2 is selected from the group consisting of a benzenesulfonyl group of formula III, or formula IV : (III) (IV) and when the compound of formula (I) and (II) comprises an amino group pharmaceutically acceptable ammonium salts thereof, wherein R1, R2, Cx, n, R3, R4, R5, Y are as defined in the specification. |