Protein-binding doxorubicin peptide derivatives

A doxorubicin-peptide of the formula I

• wherein
• Y=O or S
• n=1 to 5
• m=0 to 6
• P5-P′5 denotes a peptide sequence consisting of up to ten amino acids, said amino acids being selected from the group consisting of the twenty essential amino acids,
• wherein the peptide sequence can be cleaved by the matrix metalloproteinase 2 and/or 9 (MMP-2 and/or MMP-9) and
• PM is a protein-binding group which is a maleinimide group, a 2-dithiopyridyl group, a halogen acetamide group, a halogen acetate group, a disulfide group, an acrylic acid ester group, a monoalkylmaleic acid ester group, a monoalkylmaleaminic acid amide group, an isothiocyanate group or an aziridine group, which is optionally substituted and