DENDRIMERIC SUPPORT OR CARRIER MACROMOLECULE

摘要

The present invention provides also intermediates, which are useful in preparing the dendrimers of the invention. In ove aspect, the invention provides an isolated, purified symmetrical anhydride of a protected 1,3-diol carboxylic acid. The anhydride is preferably an easily handled, stablesolid, unlike previous methods, the anhydride is prepared and purified prior to its use in the methods of the invention. Thus, the present invention provides an anhydride that is substentially free of contaminanting side products.