Sulfadiazine sodium Molecular Formula:C10H9N4NaO2S Molecular Weight:272.26 Property: white crystalline powder, odorless and slightly bitter; color becomes dark on meeting light; If being exposed in the wet air for a long time, it will slowly absorb carbon dioxide and produce sulfadiazine. It is easy soluble in water and slightly soluble in alcohol. USP 24 / 25