| http://www.w3.org/ns/prov#value | - wherein the substituent R.sup.d, defined above, is attached to one of the carbon atoms of the ring; andY is selected from:i) COOH or a pharmaceutically acceptable ester thereof;ii) COOM wherein M is an alkali metal or other pharmaceutically acceptable salt;iii) COOM wherein M is a negative charge in the case where a permanent positive charge exists elsewhere in the molecule.The R.sup.c.sub.(1-3) s
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