1-benzyloxy-2-oxo-3-[(carboxymethyl)oxy]-6-pyridinecarboxylic acid dimethyl ester
1-benzyloxy-2-oxo-3-[(carboxymethyl)oxy]-6-pyridinecarboxylic acid 6-methyl ester
N,N''-bis[1-benzyloxy-2-oxo-3-[(carboxyamidomethyl)oxy]-6-(methoxycarbonyl)pyridine]-N'-[2-[2-(2-methoxyethoxy)ethoxy]ethoxy]-bis(2-aminoethyl)amine
N,N''-bis[1-benzyloxy-2-oxo-3-[(carboxyamidomethyl)oxy]-6-carbonyl(2-mercaptothiazolide)pyridine]-N'-[2-[2-(2-methoxyethoxy)ethoxy]ethoxy]-bis(2-aminoethyl)amine