medicinal compounds bound to colloids

A compound of formula (I) ** Formula ** wherein X is an active colloid compound, selected from the group consisting of amylases, amylopectins, acemannans, arabinogalactans, galactomannans, galactoglucomannan, xanthan, carrageenan, hyaluronic acid, deacetylated hyaluronic acid, starch and modified starch selected from the group consisting of hydroxyalkyl starches, esterified starches, carboxyalkyl starches, hydroxyalkyl carboxyalkyl starch, hydroxyalkyl starch starch, hydroxyalkyl carboxyalkyl starch starch and carboxyalkyl starch starch; L1 is a first linker through which X and the phosphate group are covalently linked and wherein L1 is selected from the group consisting of a single bond, alkanyl, alkenyl and alkyldiyl; L2 is a second linker through which the phosphate group and A covalently bind; A is a medically active substance selected from the group consisting of antibiotics, chemotherapeutics, cytostatic agents, antigens, oligonucleotides, analgesics and cytotoxic substances or a fluorescent marker; Y is H or OH; n is an integer of at least 1.