Sodium (trihydroxy)phenylborate, also known as sodium phenylborate trihydrate or sodium 2-hydroxy-5-(trihydroxyboranyl)benzoate, is an organoboron compound commonly used in cosmetics and pharmaceuticals for its anti-inflammatory and antimicrobial properties. It consists of a phenyl ring substituted with hydroxyl groups and a borate moiety, giving it chelating and stabilizing characteristics.