Zawadowski, T Synthesis of alpha-[7-methyl-9-methoxy-5-oxo-furo-[3,2-g] [1]-benzopyranoxy-4]-butyric and valeric acids and their aminoesters. [electronic resource] - Polish journal of pharmacology and pharmacy - 633-6 p. digital Publication Type: Journal Article ISSN: 0301-0244 Subjects--Topical Terms: Aminobutyrates--chemical synthesisAntihypertensive Agents--chemical synthesisBenzopyrans--chemical synthesisButyrates--chemical synthesisKhellin--analogs & derivativesValerates--chemical synthesis