Patent ID: 8790892

Claim:
A substituted anthraquinone dye of Formula 5: wherein: each R a and R b is independently H, methyl, methoxy or a halogen; each m and n is independently 0, 1, or 2; R 1 and R 2 are H; each R 3 is independently H, methyl, formyl, acetyl, an alkanoyl having the formula of Formula 2, or an alkyl having the formula of Formula 3: -L 2 -X 2 Formula 3 L 1 is a link comprising 2-12 atoms selected from C, N, and O; X 1 is a substituent selected from the group consisting of a substituted or unsubstituted amino, a substituted or unsubstituted amidino, a substituted or unsubstituted guanidino, a substituted or unsubstituted aminooxy, a substituted or unsubstituted hydroxylamino, a substituted or unsubstituted hydrazino, a C 3-6 trialkylammonium, a substituted or unsubstituted, natural or unnatural amino acid with a free alpha- or beta-amine where the amino acid is attached to L 1 via an amide bond; L 2 is a link comprising 2-12 atoms selected from C, N, and O; X 2 is selected from the group consisting of a substituted or unsubstituted amidino, a substituted or unsubstituted guanidino, a substituted or unsubstituted aminooxy, a substituted or unsubstituted hydroxylamino, a substituted or unsubstituted hydrazino, a substituted or unsubstituted, natural or unnatural amino acid where the amino acid is attached to L 2 via an amide bond; or X 2 is a mono-, di- or trisubstituted amino group; L 4 is -L 2 -X 2 ′-L 2 ′-X 2 ″-L 2 ″-, wherein L 2 , L 2 ′, and L 2 ″ are independently links comprising 2-12 atoms selected from C, N, and O; and X 2 ′ and X 2 ″ are independently selected from the group consisting of a substituted or unsubstituted amidino, a substituted or unsubstituted guanidino, a substituted or unsubstituted aminooxy, a substituted or unsubstituted hydroxylamino, a substituted or unsubstituted hydrazino, a substituted or unsubstituted, natural or unnatural amino acid with a free alpha- or beta-amine where the amino acid is attached to L 2 via an amide bond; or X 2 is a mono-, di- or trisubstituted amino group.