The derived KIEs for Neu5Acα2,3LacβSPh for the ring oxygen ((18)V/K), leaving group oxygen ((18)V/K), C3-S deuterium ((D)V/K(S)) and C3-R deuterium ((D)V/K(R)) are 1.029 ± 0.002, 0.983 ± 0.001, 1.034 ± 0.002, and 1.043 ± 0.002, respectively.