analysis of the proton and deuterium decoupled 13c nmr spectra of [ 2-13c ] ac ( = s ) coa that has exchanged 37 % of the alpha-hydrogens in the presence of citrate synthase indicates that the relative proportions of ch3 , ch2d , chd2 , and cd3 were 0.29 , 0.39 , 0.25 , and 0.07 , respectively .
C0011744
deuterium
C0020275
hydrogens