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Pharmaceutical PreparationsSpectrophotometric DeterminationQuantitative DeterminationDrug IndustryThin Layer ChromatographyPharmaceutical FieldPharmaceutical ProductsChromatographic DeterminationAcetylsalicylic AcidOral AdministrationGas ChromatographicPharmaceuticalDrugsthe Pharmaceutical IndustryThin-Layer ChromatographyUrinary ExcretionSimultaneous DeterminationHigh Pressure Liquid ChromatographyChromatographic SeparationLiquid Chromatography