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- [21] An approach to the precise chemoenzymatic synthesis of 13C-labeled sialyloligosaccharide on an intact glycoprotein:: A novel one-pot [3-13C]-labeling method for sialic acid analogues by control of the reversible aldolase reaction, enzymatic synthesis of [3-13C]-NeuAc-α-(2→3)-[U-13C]-Gal-β-(1→4)-GlcNAc-β- sequence onto glycoprotein, and its conformational analysis by developed NMR techniques JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2000, 122 (24) : 5678 - 5694