title: Use of circular dichroism in analysis of mixtures of tetracycline and 4-epitetracycline and its application to assay of commercial products.
mesh_terms: D002942:Circular Dichroism; D004338:Drug Combinations; D007536:Isomerism; D008433:Mathematics; D008722:Methods; D013056:Spectrophotometry, Ultraviolet; D013752:Tetracycline / Q000032:analysis*
chemical_list: D004338:Drug Combinations; D013752:Tetracycline