| abstract |
A compound of formula (I): ##STR1## or a pharmaceutically acceptable salt, thereof, in which R 1 is hydrogen, halogen, or trifluoromethyl, n R 2 is hydrogen or halogen, n R 3 is hydrogen or methyl. n R 4 is --O(CH 2 ) a CO 2 H, --O(CH 2 ) b M, --CO 2 H or an ester n or amide derivative thereof in which n a is an integer from 1 to 6, n b is an integer from 2 to 7, and n M is hydroxy, C 1-6 alkoxy or ##STR2## in which R 5 and R 6 are each hydrogen or C 1-6 alkyl or ##STR3## together form a five or six membered ring, and n is 1 or 2; a process for preparing such a compound and its use in medicine and agriculture. |