| abstract |
Compound corresponding to formula (I), in which R1 represents 1-hydroxyethyl, 1-fluoroethyl or hydroxymethyl; R2 represents hydrogen or C1-4 alkyl; R3 and R4 are ortho to each other, where R3 and R4 represent, independently of one another, hydroxy or its esters hydrolyzable in vivo; the benzene ring being optionally further substituted; or its pharmaceutically acceptable salt or its ester hydrolyzable in vivo. |