Flavonol glycosides and monoterpenoids from Potentilla anserina.

Potentilin A (1), a rare diflavonol ester of mu-truxinic acid and a new normonoterpenoid, 2,6-dimethyl-2,3-dihydro-4-oxo-4H-pyran-2-acetic acid (2), was isolated from Potentilla anserina, together with 19 known flavonol glycosides (3-21) and 2 known monterpenoids (22,23). Their structures were elucidated by means of UV, IR, HR-ESI-MS, 1D and 2D NMR spectroscopic data.

Cytotoxic triterpenoid saponins from the roots of Ardisia crenata.

Ardisiacrenoside I (1), a new triterpenoid pentasaccharide with an unusual glycosyl glycerol side chain, was isolated from Ardisia crenata together with five closely related triterpenoid saponins. Their structures were elucidated by a combination of mass spectrometry, IR, 1D, and 2D NMR spectroscopy. Their cytotoxic activities were evaluated against several different human tumor cell lines by the 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyl tetrazolium bromide (MTT) method.

New hepatoprotective coumarinolignoids from Mallotus apelta.

Three new coumarinolignoids, malloapelins A-C (1-3, resp.), together with three known coumarinolignoids, cleomiscosin A (4), cleomiscosin B (5), and 5'-demethylaquillochin (6), were isolated from the roots of Mallotus apelta MUELL.-ARG.

Barium divanadium(V) tellurite(IV).

A new three-dimensional bimetallic tellurite, BaV2TeO8, was synthesized by the hydrothermal reaction of Ba(OH)2, TeO2 and V2O5, and characterized by single-crystal X-ray diffraction. The three-dimensional framework is built up from anionic [V2TeO8]n(2n-) layers parallel to (101) and connected via Ba-O bonds. The anionic layers are formed by three types of polyhedra, namely VO5 tetragonal pyramids, VO(4) tetrahedra and TeO(4+2) 'folded square' polyhedra.

[Determination of primary structure of a novel peptide from mistletoe and its antitumor activity].

Aim: To study the antitumor peptide components in the stems and leaves of mistletoe (Viscum coloratum (Kom.) Nakai), the primary structure of the novel peptide was elucidated.

Methods: Cation exchange, gel filtration and HPLC were employed for isolation and purification.