1-benzyloxy-2-oxo-3-[(carboxymethyl)oxy]-6-pyridinecarboxylic acid 6-methyl ester
1-benzyloxy-2-oxo-3-[(carboxymethyl)oxy]-6-pyridinecarboxylic acid dimethyl ester
1-hydroxy-2-oxo-3-[(carboxymethyl)oxy]-6-pyridinecarboxylic acid
2-bromo-3-[(carboxymethyl)oxy]-6-carboxypyridine-N-oxide
2-bromo-3-[(carboxymethyl)oxy]-6-pyridinecarboxylic acid