Abstract: Novel mannobiose derivative represented by the general formula [I]: ##STR1## wherein groups of R.sub.1 to R.sub.5 each represents --OH, --OR.sub.6, --NHR.sub.6, (R.sub.6 represents an acyl group) or a group represented by the following formula (a), (b), (c), (d) or (e), provided that one of R.sub.1 to R.sub.5 represents --OR.sub.6 or --NHR.sub.6, one of the other 4 groups of R.sub.1 to R.sub.5 represents one of the groups represented by the formulae (a) to (e), and the remaining 3 groups of R.sub.1 to R.sub.5 represent --OH: ##STR2## wherein represents .alpha. or .beta. bond are provided by the invention.These compounds give liposomes a specific affinity for Kupffer cells of liver, and can be produced industrially.

Abstract: A pharmaceutical composition containing as its active ingredient a disaccharide derivative having a derivative group of the following formula (1) bonded to a carbon atom of a disaccharide: ##STR1## wherein Y is a member of the group consisting of NH and O; and when Y is NH, Z is a member of the class consisting of --O-- (disaccharide residue) and --O--, with the proviso that one of the two bonds is attached to the other carbon atom of the same disaccharide to which the formula (1) group is bonded, and when Y is O, Z is a member of the class consisting of --NH.sub.2 and --O--, with the proviso that one of the two bonds is attached to a carbon atom of a disaccharide different from that to which the formula (1) group is bonded. The disaccharide derivative can be prepared by reacting a disaccharide with an activating agent selected from the group consisting of the cyanogen halides, organic cyanic acid esters and halogenocarbonic acid alkyl esters.