Secondary metabolites from the roots of Phlomis umbrosa.

The phytochemical study of the roots of Phlomis umbrosa Turcz afforded a new phenylethanoid glycoside, 3-hydroxy-4-methoxy-ß-phenylethoxy-O-[2,3-diacetyl-α-l-rhamnopyranosyl-(1 â†’ 3)]-4-O-cis-feruloyl-[ß-d-apiofuranosyl-(1 â†’ 6)]-ß-d-glucopyranoside (1), and two new 28-noroleanane-derived spirocyclic triterpenoids, phlomishexaol C (2) and phlomishexaol D (3). Their structures were elucidated on the basis of 1D and 2D NMR analyses, in combination with high-resolution MS experiment.