title: Anhydrotetracycline and 4-epianhydrotetracycline in market tetracyclines and aged tetracycline products.
mesh_terms: D002214:Capsules; D002845:Chromatography; D002951:Citrates; D003124:Colorimetry; D003707:Demeclocycline / Q000032:analysis; D004340:Drug Contamination; D004355:Drug Stability; D004356:Drug Storage; D006863:Hydrogen-Ion Concentration; D008722:Methods; D011208:Powders; D012382:Rolitetracycline / Q000032:analysis; D012996:Solutions; D013053:Spectrophotometry; D013752:Tetracycline / Q000032:analysis*; D013997:Time Factors; D014466:Ultraviolet Rays
chemical_list: D002214:Capsules; D002951:Citrates; D011208:Powders; D012996:Solutions; D003707:Demeclocycline; D013752:Tetracycline; D012382:Rolitetracycline