title: Experiments on the synthesis of tetracycline. X. Synthesis of a tetracyclic compound suitable for 12 alpha-hydroxylation.
mesh_terms: D002264:Carboxylic Acids; D005663:Furans; D009279:Naphthacenes / Q000138:chemical synthesis*; D013752:Tetracycline / Q000138:chemical synthesis*
chemical_list: D002264:Carboxylic Acids; D005663:Furans; D009279:Naphthacenes; D013752:Tetracycline