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Page Scheme S1 S2 Scheme S2 S2 Scheme S3 S2 General procedures S3 p-Nitrophenyl 2, 3, 4, 6-tetra-O-benzyl-1-thio-α-D-glucopyranoside 2 S5 General procedure for desulfurization reaction S5 N-Acetyl-DL-cysteine-S-(2, 3, 4, 6-tetra-O-benzyl-β-D-glucopyaranoside) methyl ester 4 S6 N-Acetyl-DL-cysteine-S-(2, 3, 4-tri-O-benzyl-1-thio-α-L-fucopyranoside) methyl ester 6 S7 N-Acetyl-DL-cysteine-S-(2, 3, 4, 6-tetra-O-acetyl-β-D-glucopyaranoside) methyl ester 8 S8 N-Acetyl-DL-cysteinamide-S-(2, 3, 4, 6-tetra-O-acetyl-β-D-glucopyaranoside) 10 S9 N-Acetyl-DL-cysteine-S-(2, 3, 4, 6-tetra-O-acetyl-β-D-galactopyaranoside) methyl ester 12 S10 N-Acetyl-DL-cysteine-S-(3, 4, 6-tetra-O-acetyl-2-acetamido-2-deoxy-β-D-glucopyaranoside) methyl ester 14

S11 N-Acetyl-DL-cysteine-S-(β-D-glucopyranoside) methyl ester 16 S12 N-Acetyl-DL-cysteine-S-(2-acetamido-2-deoxy-β-D-glucopyranoside) methyl ester 18 S12 N-Acetyl-DL-cysteine-S-(2, 3, 4, 6-tetra-O-acetyl-β-D-glucopyaranoside)-O-tert-butyl-L-serine-glycine ethyl ester 20