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We show that the chemoselectivity of an electrophile in protein labeling can be promiscuous. An aldehyde enables switching of chemoselectivity of an epoxide and a sulfonate ester along with an enhanced rate of reaction. The chemical technology renders single-site installation of diverse probes on a protein and delivers analytically pure tagged proteins.

Graphical abstract: Aldehydes can switch the chemoselectivity of electrophiles in protein labeling

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