4-Chloro-1-naphthol (CAS NO.604-44-4), its Synonyms are 1-Naphthalenol, 4-chloro- ; 1-Naphthol, 4-chloro- (8CI) ; 1-Chloro-4-hydroxynaphthalene ; 4-Chloro-alpha-naphthol . It is off white to tan crystals.