Constituents of Umbelliferous Plants. IV. The Coumarins of Peucedanum palustre L. The Structure of a New Coumarin.

Abstract
A coumarin, C19H20O5, obtained from the root of Peucedanum palustre is shown to be (+)-8-(l-angeloyloxy-l-methylethyl)-8,9-dihydro-2H-furo[2,3-h]-l-benzopyran-2-one. I is shown to possess the same configuration at C-8 as athamantin and archangelicin. Furthermore, the root afforded isoimperatorin, (+)-oxypeucedanin, ostruthol, and (+)-oxypeucedanin hydrate.

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