Patent ID: 7459478

Claim:
A compound of formula II: wherein: X is hydrogen, an alkali metal or a basic amine moiety; R 1 is C 1 -C 8 alkyl, C 3 -C 6 cycloalkyl, —CH 2 —C 3 -C 6 cycloalkyl, pyridinyl, —CH 2 -pyridinyl, phenyl or benzyl, wherein the rings of the cycloalkyl, pyridinyl, phenyl and benzyl groups may be optionally substituted by from 1 to 3 groups selected from halogen, C 1 -C 6 alkyl, C 1 -C 6 perfluoroalkyl, —O—C 1 -C 6 perfluoroalkyl, C 1 -C 6 alkoxy, —OH, —NH 2 , or —NO 2 ; R 2 is hydrogen, halogen, C 1 -C 6 alkyl, C 1 -C 3 perfluoroalkyl, C 1 -C 6 alkoxy, C 3 -C 6 cycloalkyl, —CH 2 —C 3 -C 6 cycloalkyl, hydroxy, —NH 2 , or —NO 2 ; R 3 is hydrogen, halogen, C 1 -C 6 alkyl, C 1 -C 3 perfluoroalkyl, C 1 -C 6 alkoxy, C 3 -C 6 cycloalkyl, —CH 2 —C 3 -C 6 cycloalkyl, hydroxy, —NH 2 , —NO 2 , phenyl, benzyl, benzyloxy, pyridinyl, or —CH 2 -pyridinyl, wherein the rings of these groups may be optionally substituted by from 1 to 3 groups selected from phenyl, halogen, C 1 -C 6 alkyl, C 1 -C 6 perfluoroalkyl, C 1 -C 6 alkoxy, —OH, —NH 2 , or —NO 2 ; or a pharmaceutically acceptable salt or ester form thereof.