| 摘要 |
Disclosed are compounds having the formula (I) wherein R2 is hydrogen, a monomeric glycoside or an oligomeric glycoside, R3 is hydrogen, a monomeric glycoside, an oligomeric glycoside, or a group having the formula (II), R is a lower alkylene, R' is selected from the group consisting of moieties having the formula (III), (IV) and (V) where X = 0 or 1, Y = 0 or 1, R1 is hydrogen or a pharmacologically active drug residue, R8 a pharmacologically active dr ug residue, R4, R5, and R6 are independently hydrogen, alkyl, aryl, aralkyl, an d cycloalkyl or together form a nitrogen-containing ring, and R7 is hydroxyl o r hydroxyalkyl.
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