Patent ID: 8501939

Claim:
A compound of the formula (I) wherein Q 1 represents —NR 1 R 3 ; and Q 2 represents —NR 2 R 4 ; in which R 1 and R 2 which may be the same or different, independently represent an alkyl group selected from the group consisting of hexyl, 1-methylpentyl, 2-methylpentyl, 3-methylpentyl, 4-methylpentyl, 2-ethylbutyl, 1,1-dimethylbutyl, 1,2-dimethylbutyl, 1, 3-dimethylbutyl, heptyl, 1,4-dimethylpentyl, 2,4-dimethylpentyl, octyl, nonyl, decyl, undecyl, and dodecyl; R 3 and R 4 both represent methyl; and A represents the point of attachment to a support matrix, optionally through a spacer linkage interposed between the matrix and the compound of formula (I).