1,6:2,3-Dianhydro-4-O-(2,3-di-O-benzyl-β-D-glucopyranosyl)-β-D-mannopyranose1,6:2,3-Dianhydro-4-O-(2,3-di-O-benzyl-β-D-glucopyranosyl)-β-D-mannopyranose ≥99%