| abstract |
A compound of Formulae (1), (2) or (3), A1-Ph (1) or A1-Ar-A2 (2) or A1-(A2)A’-A3 (3) wherein A1, A2 and A3 are selected from Formulae (4), (5) and (6), or a salt whereof; wherein Ar is selected from the group consisting of 1,2-phenyl, 1,3-phenyl and 1,4-phenyl optionally substituted with one or more methyl groups; m and n are independently integers from 0 to l; Ph is phenyl, optionally substituted with one or more methyl groups; Arl is trisubstituted phenyl optionally substituted with one or more phenyl groups; and R1, R2 and R3 are independently selected from the group consisting of H, Me and linear chain C2- C4 alkyl. |