T 3765 (OTTOKEMI) Trifluoroacetic acid, for HPLC 99.9% Cas 76-05-1 - used in peptide synthesis and other organic transformations involving deprotection of t-BOC group. TFA finds use as an ion pairing agent in liquid chromatography, as a solvent in NMR spectroscopy and as a calibrant in mass spectrometry.