the macroscopic deprotonation constants of phenol , pyridine , p-nitrophenol , salicylaldehyde , 4-pyridinaldehyde , pyridoxine , 3-hydroxypyridine , 5-deoxypyridoxal , pyridoxal , and pyridoxal 5'-phosphate have been determined at 25 degrees c in water/dioxane mixtures .
C0034272
pyridoxine
C0034266
pyridoxal 5