Purification of Phenothiazine find Production of its Oxidation Derivatives. 3 Chromatography and Spectrophotometry of Phenothiazine and its Derivatives. 8 Chromatography and Spectrophotometry of Phenothiazine and its Derivatives after Extraction from the Body, Isolation of the Metabolites from Bile, 14 Isolation and Identification of Phenothiazine and its Metabolites in the Caecal Contents, Isolation and Identification of Phenothiazine and its Metabolites in Excreta, RESULTS