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Direct trifluoromethylation of proteins (a) myoglobin (Mb, MWcalc = 16951.5) deconvoluted LC-MS spectrum showing singly- (MWcalc = 17019, MWfound = 17020) and doubly- modified (MWcalc = 17087, MWfound = 17087), (b) tryptic-LC-MS/MS confirmed site-selectivity at Trp7 and Trp14.
