| abstract |
A pharmaceutical compound of the formula: <IMAGE> (I) in which R1 is hydrogen, hydroxy or C1-6 alkoxy, R2 is hydrogen, carboxy, tetrazolyl, -SO2H, -SO3H, -OSO3H, -CONHOH, or -P(OH)OR', -PO(OH)OR', -OP(OH)OR' or -OPO(OH)OR' where R' is hydrogen, C1-6 alkyl, C2-6 alkenyl or aryl C1-6 alkyl, R3 is hydrogen, hydroxy or C1-4 alkoxy, and R4 is fluoro, trifluoromethyl, nitro, C1-6 alkyl, C3-7 cycloalkyl, C2-6 alkenyl, C2-6 alkynyl, C1-6 alkylthio, heteroaryl, optionally substituted aryl, optionally substituted aryl C1-6 alkyl, optionally substituted aryl C2-6 alkenyl, optionally substituted aryl C2-6 alkynyl, optionally substituted aryloxy, optionally substituted aryl C1-6 alkoxy, optionally substituted arylthio, optionally substituted aryl C1-6 alkylthio or -CONR''R''', -SO2NR''R'''', -NR''R''', -OCONR''R''' or -SONR''R''' where R'' and R''' are each hydrogen, C1-6 alkyl or aryl C1-6 alkyl, or R'' and R''' together form a C3-7 alkylene ring; provided that (i) R1, R2 and R3 are not all hydrogen,and (ii) when R2 and R3 are hydrogen and R1 is hydroxy, R4 is not fluoro; or a salt or ester thereof. |