| 摘要 |
Compounds of the formula (I): <CHEM> and salts thereof; wherein A is a group NR<3>SO2 or SO2NR<3>; B is C1-6alkylene; Y is CO2H or a group hydrolysable to CO2H; R<1> is phenyl optionally substituted by one or more substituents chosen from the group comprising halogen, C1-4alkyl, C1-6acyl, C1-4alkoxy, nitro and trifluoromethyl, provided that when R<1> is phenyl substituted by two or more substituents, no more than one substituent can be meta-trifluoromethyl; R<2> is hydrogen or one or more C1-4alkyl substituents; and R<3> is hydrogen or C1-6alkyl. |
