| 摘要 |
A compound of the formula (I): <CHEM> wherein R<1> and R<2> are, independently, a hydrogen atom, a monosaccharide residue, a protected monosaccharide residue, or a protecting group for hydroxyl group, but at least one of R<1> and R<2> is a monosaccharide residue or a protected monosaccharide residue, and R<3> is a hydrogen atom, a hydroxyl group, an alkyl group, an aryl group, or an aralkyl group, with the proviso that (1) when R<1> and R<2> are glucose residues at the same time, R<3> is not a hydrogen atom, (2) when R<1> is a hydrogen atom, an acetyl group or a benzyl group and R<2> is a glucose residue, an acetylated glucose residue, or acetalized glucose residue, R<3> is not a hydrogen atom, or (3) when R<1> is a glucose residue and R<2> is a hydrogen atom, R<3> is not a hydrogen atom or a salt thereof is disclosed. |
