Complexes with .sup.99m Tc suitable for radiolabelling monoclonal antibodies or other macro molecules

Abstract

The ligand L, (R.sup.3)(R.sup.4)(R.sup.5)C--N(R)--C(R.sup.1)(R.sup.2)--(CH.sub.2).sub.n --COOH L where R is hydrogen, hydroxy, alkyl, hydroxyalkyl, or alkylcarboxy, or R and R.sup.1 together may form a mono-, di-, tri-, or tetra-methylene radical, or R and R.sup.3 together may form a mono-, di-, tri-, or tetra-methylene radical, and R.sup.1 and R.sub.2 may be the same or different and are selected from hydrogen, hydroxy, alkyl, hydroxyalkyl, carboxy, alkylcarboxy, alkylamine, alkylthiol, aryl or R.sup.1 and R.sup.2 together may form a tetra- or penta-methylene radical, and R.sup.3 and R.sup.4 and R.sup.5 may be the same or different and are selected from hydrogen, hydroxy, alkyl, hydroxyalkyl, carboxy, alkylcarboxy, provided that at least one of R.sup.3, R.sup.4 and R.sup.5 is hydroxyalkyl, and n is equal to 0, 1 or 2, for example tricine, form useful complexes with .sup.99m Tc, for radiolabelling macromolecules such as monoclonal antibodies.

Dependencies are inferred from the claim text.