Polyarylate containing derivatives of the natural amino acid L-tyrosine

An amino acid-derived polyarylate comprised of one or more recurring structural units represented by the formula:

• ##STR11## wherein X is selected from the group consisting of --H, --NHL.sub.1, --NL.sub.1 L.sub.2,:
• ##STR12## Y is hydrogen or an ester group having the structure:
• ##STR13## wherein L.sub.1, L.sub.2 and L.sub.3 are independently selected from the group consisting of straight or branched alkyl and alkylaryl groups containing up to 18 carbon atoms and a biologically or pharmacologically active ligand;
• and
• R is selected from the group consisting of saturated and unsaturated, substituted and unsubstituted alkyl, aryl and alkylaryl groups containing up to 18 carbon atoms.