Phenylmethyl 2,3-O-[(1S,2S)-1,2-Dimethoxy-1,2-dimethyl-1,2-ethanediyl]-α-L-xylopyranoside 4-(1,1,1-Trifluoromethanesulfonate) is an intermediate used in the synthesis of Isofagomine D-Tartrate (I816010), which is used as human acid β-glucosidase inhibitor and for the treatment of Gaucher disease.