With the object to obtain the antagonists of vitamin B_6,following compounds were prepared ; pyridoxal-5-sulfate, pyridoxamine-5-sulfate, pyridoxine-5-sulfate, deoxypyridoxine-5-sulfate and pyridoxalmonoethylacetal-3-sulfate and so on. Several reactions between pyridoxine analogues and chlorosulfonic acid are described.
