alpha 4-O-Benzoyl-pyridoxine (PN-4'MB) and alpha 5-O-benzoyl-pyridoxine (PN-5'MB) were hydrolyzed in 10% aqueous solution of acetone at pH 1-4. They were hydrolyzed obeying apparent first-order kinetics. In the pH range of 1-7, PN-4'MB was hydrolyzed 10 times faster than PN-5'-MB. At pH 7-12, an
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