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Solid phase extraction and liquid chromatographic determination of sildenafil and N-demethylsidenafil in rat serum with basic mobile phase

Liquid Chromatographic DeterminationSolid Phase ExtractionPharmacological StudyMedicineDrug PurityClinical ChemistryChromatographyPharmacologyBasic Mobile PhasePharmacokineticsDrug DiscoveryDrug Analysis