A compound of the formula (I): ##STR1## wherein R.sup.1 and R.sup.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.sup.1 and R.sup.2 is a monosaccharide residue or a protected monosaccharide residue, and R.sup.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.sup.1 and R.sup.2 are glucose residues at the same time, R.sup.3 is not a hydrogen atom, (2) when R.sup.1 is a hydrogen atom, an acetyl group or a benzyl group and R.sup.2 is a glucose residue, an acetylated glucose residue, or acetalized glucose residue, R.sup.3 is not a hydrogen atom, or (3) when R.sup.1 is a glucose residue and R.sup.2 is a hydrogen atom, R.sup.3 is not a hydrogen atom or a salt thereof is disclosed.
化合物的公式(I):##STR1## 其中R.sup.1和R.sup.2分别是氢原子、
单糖残基、受保护的
单糖残基或羟基保护基,但R.sup.1和R.sup.2中至少有一个是
单糖残基或受保护的
单糖残基,而R.sup.3是氢原子、羟基、烷基、芳基或芳烷基,但有条件限制:(1)当R.sup.1和R.sup.2同时为
葡萄糖残基时,R.sup.3不是氢原子,(2)当R.sup.1是氢原子、乙酰基或苄基,而R.sup.2是
葡萄糖残基、乙酰化
葡萄糖残基或
缩醛化
葡萄糖残基时,R.sup.3不是氢原子,或(3)当R.sup.1是
葡萄糖残基,而R.sup.2是氢原子时,R.sup.3不是氢原子或其盐。