Modified cytostatic agents

Compounds of the general formula (I)

• 31
• in which
• 32
• represents 1 to n′ groups
• 33
• which are identical to or different from one another, where n is a number 1 to n′ and n′ corresponds to the maximum number of possible linkage sites of M,
• in which
• Ar represents an aryl radical having up to 10 carbon atoms, which additionally to X can optionally be mono- or polysubstituted by alkyl having up to 6 carbon atoms, alkoxy having up to 6 carbon atoms, alkoxycarbonyl having up to 6 carbon atoms, hydroxyl, carboxyl, carboxyalkyl having up to 6 carbon atoms, cyano, nitro, isocyanato, isothiocyanato, halogen, sulphonyl and/or sulphonamide,
• X represents a direct single bond or alkylene having up to 6 carbon atoms,
• M represents a mono-, di-, tri- or tetrapeptide, which is linked via the α-amino group and/or via amino and/or hydroxy groups of the side chains to the n groups
• 34
• which are identical to or different from one another, where further functional groups of the peptide can optionally carry protective groups,
• C represents a radical of a cytostatic or of a cytostatic derivative which is linked to m via an amino function or via an oxygen atom,
• and their stereoisomers, stereoisomer mixtures and salts.