Myxaoside A, a new triterpenoid saponin from L. (Boraginaceae).

The phytochemical study of L. led to the isolation, through chromatographic techniques, of a new triterpenoid saponin, 3--[--rhamnopyranosyl-(1→3)-(6--acetyl---glucopyranosyl)]-22-hydroxyolean-12-ene () namely Myxaoside A, together with three known compounds, Soyasaponine I (), oleanolic acid (), and 3--acetyl-oleanolic acid (). All structures were established, based on 1 & 2D-NMR spectroscopic analysis and comparison with previous published reports.

Chemical constituents from L. (Boraginaceae) and their antibacterial activity.

Chemical investigation of L. (Boraginaceae) resulted in the isolation of the following ten known compounds: 1-naphthaleneacetic-5-carboxy-1,2,3,4,4a,7,8,8a-octahydro-1,2,4a-trimethyl-[1-(1,2, 4a,8a)]-acid (), hexacosanoate-1-glyceryl (), 3-urs-12,20(30)-diene-27,28-dioic acid (), 3-D-glucopyranosylurs-12,20(30)-diene-27,28-dioic acid (), stigmasterol (), stigmasterol-3---D-glucopyranoside (), oleanolic-acid (), 3--acetyl-oleanolic acid (), betulin () and spinasterol-3--D-glucopyranoside (). The isolated compounds were characterised by using spectroscopic methods, 1D and 2D NMR, mass spectroscopy (ESI-MS) and by comparison with the literature data.

Ternifoliasaponin, a new triterpenoid saponin from the roots of Schumach & Thonn (Rubiaceae).

A new triterpenoid saponin, Ternifoliasaponin (), together with four known compounds () chikusetsusaponin IVa (), chikusetsusaponin IVa methyl ester (), bonushenricoside B ) and Dianoside C () were isolated from roots of Schumach. & Thonn (Rubiaceae). The structures of isolated compounds were elucidated on the basis of spectroscopic analysis and chemical methods.