title: Studies on the syntheses of tetracycline derivatives. I. Thermolytic cycloaddition of o-quinodimethanes with naphthoquinone.
mesh_terms: D003500:Cyclization; D008738:Methyl Ethers; D009285:Naphthoquinones; D013752:Tetracycline / Q000138:chemical synthesis; D013754:Tetracyclines
chemical_list: D008738:Methyl Ethers; D009285:Naphthoquinones; D013754:Tetracyclines; D013752:Tetracycline