| Popis: |
A new and rare type of iridoid glycoside, agnusoside (1), a new caffeoylquinic acid derivative, castusic acid (2), and a new sugar ester, 1,2-di-(4-hydroxybenzoyl)-ß-glucopyranose (3), along with ten known compounds belonging to iridoid glycosides (agnuside, trans-eurostoside), caffeoylquinic acid derivatives (chlorogenic acid and isochlorogenic acid A), flavonoids (isoorientin, isovitexin, kaempferol 3-O-sophoroside, luteolin 6-C-(2''-O-trans-caffeoyl)glucopyranoside, and simple phenolic acids (4-hydroxybenzoic acid, 3,4-dihydroxybenzoic acid), chemical classes were isolated from the flowers of Vitex agnus-castus. The structures of the isolates were established by extensive 1D- and 2D-NMR spectroscopic analysis as well as HR-ESI-MS. Agnusoside (1) represents an unusual type of iridoid glycoside with its 6-keto C(4) nonsubstituted aglycone. © 2016 Wiley-VHCA AG, Zürich |
