title: Coumarins. XII. Synthesis of (plus or minus)-cis-and trans-3',4'-dihydroxy-3',4'-dihydroxanthyletin and their diesters.
mesh_terms: D003374:Coumarins; D004952:Esters / Q000138:chemical synthesis; D004988:Ethers, Cyclic / Q000138:chemical synthesis; D006868:Hydrolysis; D009682:Magnetic Resonance Spectroscopy; D008722:Methods
chemical_list: D003374:Coumarins; D004952:Esters; D004988:Ethers, Cyclic