6-(2-(Methylsulfonyl)pyrimidin-5-yl)hex-5-ynoic acid NHS ester is a heterobifunctional crosslinker featuring a methylsulfonylpyrimidine moiety with exceptional cysteine selectivity and a reactive NHS ester for amine conjugation. Its cysteine conjugates demonstrate superior stability in aqueous media, plasma, and living cells, making this thiol-click reagent ideal for robust, precise, and biocompatible bioconjugation applications.
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