| abstract |
This invention pertains to water soluble oligosaccharide which is covalently linked to several lanthanide chelates and to a reactive group or groups through which the entire molecule can be introduced by covalent binding to biologically interesting compounds. The compounds of the invention have the structure Am - B - Cn, where B is an oligosaccharide, cyclic or non-cyclic, Am is an exactly known number of groups, same or different, covalently linked to B, capable of binding biologically interesting compounds, Cn is a plurality of lanthanide chelates, covalently linked to B, m is an integer 1 - 6 and n is an integer 2 - 40. |