| abstract |
A compound according to Formula (I), hereinbelow:wherein A-B represents a covalent bond or an optionally substituted 1,3 or 1,4 aryl ring selected from the group consisting of:X is independently selected from the group consisting of H, Br, CH3, CN, and NR1R2, wherein R1 and R2 represent hydrogen or C1-4 alkyl; branched or cyclic, optionally containing O or N; andAr represents optionally substituted phenyl or an optionally substituted 5 or 6 membered heterocylic ring containing one or more heteroatoms selected from N, O and S;provided that when Y is hydrogen, at least one Ar contains a heteroatom selected from N, S and O. |