A suitable linker molecule is needed to attach the dye and quencher to the UDP-Gal without interfering with its biological activity.
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Acetic acid (2R,3S,4S,5R,6R)-4,5-diacetoxy-6-(bis-benzyloxy-phosphoryloxy)-2-{2-[2-(9H-fluoren-9-ylmethoxycarbonylamino)-benzoylamino]-ethoxymethyl}-tetrahydro-pyran-3-yl ester
5-ethynyl-2-hydroxyacetophenone