Coumarins from Peucedanum wulongense.

A new angular dihydropyrancoumarin named wulongensin A, along with five known coumarins, (-)-anomalin, umbelliferone, (-)-smyrinol, 3′( S ),4′( S )-disenecioyloxy-3′,4′-dihydroseselin, (+)- trans -khellactone, was isolated from the root of Peucedanum wulongense . The structure of wulongensin A was established as 3′( R )-angeloyloxy-4′( R )-isovaleryloxy-3′,4′-dihydroseselin by spectroscopic methods and the absolute configurations were deduced by chemical correlations with known compounds. [ABSTRACT FROM AUTHOR]