New Coumarins from the Family Apiaceae. II. cis-khellactone Glycosides from Phlojodicarpus sibiricus

Four new cis-khellactone glycosides, which were identified as (3′S,4′S)-cis-khellactone 3′-O-β-Dgalactopyranoside (phlojosibiriside IV, 1), (3′S,4′S)-cis-khellactone 4′-O-β-D-glucopyranoside (phlojosibiriside V, 2), (3′S,4′S)-4′-O-acetyl-cis-khellactone 3′-O-β-D-glucopyranoside (phlojosibiriside VI, 3), and (3′S,4′S)-4′-O-isovaleroyl-cis-khellactone 3′-O-β-D-glucopyranoside (phlojosibiriside VII, 4) using UV, CD, and NMR spectroscopy and mass spectrometry, were observed in the subterranean organs of Phlojodicarpus sibiricus (Fisch.) Koso-Pol. (Apiaceae).