New triterpenoid and ergostane glycosides from the leaves of Hydrocotyle umbellata L - Sosa, A; Rosquete, C; Rojas, L; Pouységu, L; Quideau, S; Paululat, T; Mitaine-Offer, A C; Lacaille-Dubois, M A (Helv Chim Acta, 2011)