Countercurrent DistributionChromatography, High Pressure LiquidChromatography, Reverse-PhaseSpectrometry, Mass, Electrospray IonizationMass SpectrometryAmino Acid SequenceMolecular Sequence DataChromatography, LiquidAcetonitrilesSpectrophotometry, UltravioletDrug StabilityChromatography, AffinityCalibrationChromatography, Thin LayerReproducibility of ResultsLimit of DetectionChromatography, Ion ExchangeChromatography