N-phthalyl-S-(2,3,4,6-tetra-O-acetyl-β-D-mannopyranosyl)sulfenamide 、 4,6-bis-(mercaptomethyl)-3,7-dimethyl-1,5-diazabicyclo[3.3.0]octa-3,6-diene-2,8-dione 以11%的产率得到4,6-bis-{1-[(2,3,4,6-tetra-O-acetyl-β-D-mannopyranosyl)dithio]methyl}-3,7-dimethyl-1,5-diazabicyclo[3.3.0]octa-3,6-diene-2,8-dione