Patent ID: 7407951

Claim:
A compound of formula (I): or pharmaceutically acceptable salts, or solvates thereof, wherein: R 6 , R 7 and R 9 are independently selected from H, R, OH, OR, SH, SR, NH 2 , NHR, NRR′, nitro, Me 3 Sn and halo; where R and R′ are independently selected from C 1-7 alkyl, heterocyclyl having 3 to 20 ring atoms of which 1 to 10 are ring heteroatoms independently selected from the group consisting N, O and S and aryl or heteroaryl having 5 to 20 ring atoms, the heteroaryl groups having one or more heteratoms independently selected from the group consisting of N, O and S; R 8 is selected from H, R, OH, OR, SH, SR, NH 2 , NHR, NRR′, nitro, Me 3 Sn and halo, or the compound is a dimer with each monomer being of formula (I), where the R 8 groups of each monomers form together a dimer bridge having the formula —X—R″—X— linking the monomers, where R″ is a C 3-12 alkylene group, which chain may be interrupted by one or more heteroatoms selected from the group consisting of O, S, and NH, and/or aromatic rings selected from the group consisting of benzene and pyridine, and each X is independently selected from O, S, or NH; or any pair of adjacent groups from R 6 to R 9 together form a group —O—(CH 2 ) p —O —, where p is 1 or 2; and R 2 is a napthyl group, optionally substituted by one or more substituents selected from the group consisting of halo, C 1-7 alkyl, C 1-7 alkoxy, heterocyclyl having 3 to 20 ring atoms of which 1 to 10 are ring heteroatoms independently selected from the group consisting N, O and S and aryl or heteroaryl having 5 to 20 ring atoms, the heteroaryl groups having one or more heteratoms independently selected from the group consisting of N, O and S.