Patent ID: 7175953

Claim:
A cyanine dye of formula XVIII, in which p is 1, 2 or 3, n is 1, 2, 3, 4 or 10, R 1 and R 2 , independently of one another, are a 4-sulfobutyl, 3-sulfopropyl, 2-sulfoethyl, 3-methyl-3-sulfopropyl, methyl, ethyl or propyl radical, and R 3 is hydrogen or a radical —COOE 1 , —CONE 1 E 2 , —NHCOE 1 , —NHCONHE 1 , —NE 1 E 2 , —OE 1 , —OSO 3 E 1 , —SO 3 E 1 , or —SO 2 NHE 1 , where E 1 and E 2 , independently of one another, are a hydrogen atom or a methyl, ethyl or a C 3 –C 6 alkyl radical, which is optionally interrupted by 0 to 2 oxygen atoms and/or by 0 to 1 carbonyl groups and/or is substituted by 0 to 5 hydroxy groups.