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(A) Chemical structures of BTA 3 and its deuterated analogues as shown in a reaction scheme depicting the H/D exchange experiment. (B) Kinetic exchange experiment revealing the conversion of BTA 3-3D into BTA 3-6D at 20 and 40 °C. (C) ESI-MS spectra of the BTA 3 double sodium adducts showing the isotopic distribution at 3 min and 96 h after D2O dilution at 20 °C.
