title: A new family of tetracycline precursors. N-demethylanhydrotetracyclines.
mesh_terms: D002247:Carbon Isotopes / Q000378:metabolism; D002751:Chlortetracycline / Q000096:biosynthesis*; D003707:Demeclocycline / Q000378:metabolism*; D005001:Ethionine / Q000494:pharmacology; D013307:Streptomycin / Q000378:metabolism*; D013752:Tetracycline / Q000378:metabolism*
chemical_list: D002247:Carbon Isotopes; D003707:Demeclocycline; D013752:Tetracycline; D002751:Chlortetracycline; D005001:Ethionine; D013307:Streptomycin