Carboxylic acids and derivatives thereof and pharmaceutical compositions containing them

A composition represented by the general fomula

• where R1-Reach independently repersents an unsubstituted hydrocarbyl or heteroclyl radical;
• where R3 and R6 independently represents hydrogen, hydroxyl, lower alkyl, chloro, bromo, cyano, nitro, lower alkoxy or triflouromethyl;
• Q represents a diradical consisting of a linear chain of 4 to 14 carbon atoms, one or more of which may be replaced by heteroatoms, said chain being optionally substituted by inert substituents and one or more of said carbon or heteroatom chain members optionally forming part of a ring structure, and where one or both of the carboxyl groups can be substituted by an in vitro hydrolyzable physiologically acceptable substituent.