Patent ID: 6943168

Claim:
A compound of the formula: wherein Ar is phenyl, a six-membered or five-membered ring which is heteroaromatic or a fused aromatic or heteroaromatic system, each of which may optionally be substituted with one or more non-interfering substituents; X 1 is a linker containing 1-5 members; n is 0 or 1; each R 1 -R 3 is independently a non-interfering non-hydrogen substituent; each 1 is independently 0-5; m is 0-4; X 2 is a linker comprising a chain of at least 5 members; A is H, OR, SR, NR 2 , or halo wherein R is H or lower alkyl (1-6C); wherein phenyl rings A and B may optionally be linked by one or more CR 2 moieties wherein each R is H or lower alkyl (1-6C) wherein one or more of said CR 2 may be replaced by NR, O or S; with the proviso that (a) Ar is a five- or six-membered heteroaryl substituent or an optionally substituted fused aromatic or heteroaromatic substituent; and/or (b) n is 0 and Ar is not unsubstituted phenyl; and/or (c) m is 1-4 wherein if m is 1, R is ═O, a carboxylic acid or a carboxylic ester; and/or (d) X 2 is alkylene substituted by ═O, OR, SR, NR 2 and/or halo and at least one 1 and/or m must be >0; and/or (e) X 2 is a chain of at least 6 members; and/or (f) X 2 contains at least one heteroatom selected from N, S and O; and/or (g) A is OR, SR, NR 2 or halo, wherein R is H or lower alkyl (1-6C); and/or (h) Ar is substituted with at least one t-butyl moiety or at least one substituted alkoxy; and/or (i) X 1 includes at least one heteroatom not adjacent C═O selected from O, N and S; and/or (i) X 2 is alkylene substituted by OR, SR, NR 2 and/or halo.