| 摘要 |
A compound of formula (I): <IMAGE> (I) or a pharmaceutically acceptable salt, thereof, in which R1 is hydrogen, halogen, or trifluoromethyl, R2 is hydrogen or halogen, R3 is hydrogen or methyl. R4 is -O(CH2)a CO2H, -O(CH2)bM, -CO2H or an ester or amide derivative thereof in which a is an integer from 1 to 6, b is an integer from 2 to 7, and M is hydroxy, C1-6 alkoxy or <IMAGE> in which R5 and R6 are each hydrogen or C1-6 alkyl or <IMAGE> 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. |
