| abstract |
Substances for treating or diagnosing tumours, with preferred concentration in the tumor, are characterized in that they have at least two phenolic hydroxyl and/or amino groups, at least one aliphatic amino group, or at least one phenolic hydroxyl and/or amino group and at least one aliphatic amino group, and these groups are substituted with polyethylene glycol chains, whose degree of polymerization n is 5 to 250 and whose terminal hydroxyl group is substituted by C1?-C12? alkyl ester or ether, each substance being substituted by at least two such polyethylene glycol chains. |