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Formation of the factor Xa inhibitor 15 in the templated amidation reaction of 14 (0.285 mm) and phenyl ester 12 (A) or 2,2,2‐trifluoroethyl ester 13 (5 mm; B) at room temperature. The concentration of 15 was quantified by extracted ion chromatography HPLC/QTOF‐MS, yielding a saturation curve with c max=25.6/9.6 nm and t 1/2=1.4/1.7 h, respectively.
