A compound of formula (I) wherein R 1 and R 3 are the same or different and represent =O, hydrogen, C 1-6 alkyl, C 1-6 dialkyl , =CHC 1 -C 5 alkyl, =S, or a 5- or 6-membered aryl； R 4 to R 9 are the same or different and represent hydrogen, C 1-6 alkoxy, OCF 3 , OCH 2 CF 3 , O-cyclopropyl, OCH 2 -cyclopropyl, C 1 -C 6 alkyl, S-alkyl, NR 2 10 where R 10 is hydrogen or C 1-6 alkyl, halogen, NO 2 OH, CH 2 OC 1 -C 6 alkyl, CH 2 OH, or CF 3 ； Q 1 is hydrogen, C 1-6 alkyl, C 1-6 dialkyl, C 1-6 alkoxy, NHAc, NR 2 10 where R 10 is hydrogen or C 1-6 alkyl, difluoro, fluoro, =O, or OH； Q 2 , Q 3 , Q 4 and Q 5 are the same or different and represent hydrogen, C 1-6 alkoxy, OCF 3 , OCH 2 CF 3 , O-cycloprypyl, OCH 2 -cyclopropyl, C 1 -C 6 alkyl, S-alkyl, NR 2 10 where R 10 is hydrogen or C 1-6 alkyl, halogen, NO 2 , OH, CH 2 OC 1 -C 6 alkyl, CH 2 OH, or a 5- or 6-membered aryl； with the proviso that the compounds [4-(1-oxo-1,3-dihydro-2H-benzo[f]isoindol-2-yl)phenyl]-2-propionic acid, sodium salt and [4-(4,9-diethoxy-1-oxo-1 ,3-dihydro-2H-benzo[f]isoindol-2-yl)phenyl]acetic acid are excluded； and pharmaceutically acceptable derivatives thereof.
