L. Strekowski et al., New heptamethine cyanine reagents for labeling of biomolecules with a near-infrared chromophore, HETEROCYC C, 7(2), 2001, pp. 117-122
Reported is synthesis of cyanines 3 (lambda (max) = 1033 nm in MeOH) and 4
(lambda (max) = 1060 nm in MeOH) substituted with an isothiocyanato functio
n, and a succinimidoxycarbonyl-functionalized cyanine 10 (lambda (max) = 83
7 nm in MeOH) for labeling of biomolecules at amino groups.