Eremosides A – C, New Iridoid Glucosides from Eremostachys loasifolia

Eremosides A–C (1–3), three new iridoid glucosides, were isolated from the AcOEt-soluble fraction of the EtOH extract of the whole plant of Eremostachys loasifolia, along with buddlejoside B (4), 10-O-benzoylcatalpol (5), and pakiside A (6) reported for the first time from this species. The structures of these compounds were elucidated by spectroscopic data including 2D-NMR, FAB-MS, ESI-MS, as well as by acid and basic hydrolyses.