[N6-(6-{(2E)-2-[(2E,4E)-5-(1-ethyl-3,3-dimethyl-5-sulfo-3H-indolium-2-yl)penta-2,4-dienylidene]-3,3-dimethyl-5-sulfo-2,3-dihydro-1H-indol-1-yl}hexanoyl) lysine] 、
D-desthiobiotinamidocaproate N-hydroxy succinimidyl ester 在
N,N-二异丙基乙胺 作用下,
以
DMF (N,N-dimethyl-formamide) 为溶剂,
反应 3.0h,
生成 α-D-desthiobiotin-ε-Cy5-L-lysine-OH [N6(-{(2Z)-2-[(2E,4E)-5-(1-ethyl-3,3-dimethyl-5-sulfo-3H-indolium-2-yl)penta-2,4-dienylidene]-3,3-dimethyl-5-sulfo-2,3-dihydro-1H-indol-1-yl}hexanoyl)-N2-(6-{[6-(5-methyl-2-oxoimidazolidin-4-yl)hexanoyl]amino}hexanoyl)lysine]