The synthesis and high-resolution NMR spectroscopy of ethyl N-(2-triphenylmethylthio)ethanoyl-O-{4′-[4″-(1″-bis(2‴- chloroethyl)amino)phenyl]butanoyl}-L-seryl-S-benzyl-L-cysteine: A chelate-chlorambucil complex for use as a ligand for ^99mTc radio-imaging Journal Articles