SYNTHESIS OF SPECIFICALLY LABELLED GANGLIOSIDE 1C-13C-GM3
Glycosidation of the lactose derivative 4 with [1-13C]-sialyl xanthate 3, prepared from enzymatically obtained [1–13C]-sialic acid gave the trisaccharide 5 which was transformed into [1c-13C]-GM3 ([1c-13C]-1).