Bibenzyls and dihydroisocoumarins from white salsify (Tragopogon porrifolius subsp. porrifolius)

Tragopogon porrifolius L. subsp. porrifolius (Asteraceae, Lactuceae) yielded three new bibenzyl derivatives, 5,4′-dihydroxy-3-α-l-rhamnopyranosyl-(1→3)-β-d-xylopyranosyloxybibenzyl, 2-carboxyl-3,4′-dihydroxy-5-β-d-xylopyranosyloxybibenzyl, tragopogonic acid (2′carboxyl-3′,5′,4″-trihydroxyphenylethanone) and the new dihydroisocoumarin 6-O-methylscorzocreticoside I.