Patent ID: 7732622

Claim:
A compound of formula (I) or a pharmaceutically acceptable salt thereof; wherein, R 1 is ═O or hydrogen; R 3 is ═O, hydrogen, C 1-6 alkyl, C 1-6 dialkyl, or a 5- or 6-membered aryl; R 4 and R 9 are the same or different and represent hydrogen or C 1-6 alkoxy; R 5 and R 8 are hydrogen, or CF 3 ; R 6 and R 7 are the same or different and represent hydrogen, C 1-6 alkyl, C 1-6 alkoxy, halogen, NO 2 or CF 3 ; Q 1 is hydrogen, C 1-6 alkoxy, NHAc, or NR 2 10 , where R 10 is hydrogen or C 1-6 alkyl; Q 2 , Q 3 , Q 4 and Q 5 are the same or different and represent hydrogen, C 1-6 alkyl, C 1-6 alkoxy, halogen or a 5- or 6-membered aryl; with the proviso that the compound [4-(4,9-diethoxy-1-oxo-1,3-dihydro-2H-benzo[f]isoindol-2-yl)phenyl]acetic acid are excluded.