Phytochemical analysis of the ethanolic extract of Agathis robusta (C. Moore ex F. Muell.) F.M. Bailey

This work reports the phytochemical analysis of the ethanolic extract obtained from the leaves of Agathis robusta (C. Moore ex F. Muell.) F.M.Bailey. The methodology utilised during this study comprised classical chromatographic and spectroscopic techniques. Six compounds were identified: agathisflavone (1), 7″-O-methyl-agathisflavone (2), cupressuflavone (3), rutin (4), shikimic acid (5) and (2S)-1,2-Di-O- [(9Z,12Z,15Z)-octadeca-9,12,15-trienoyl]-3-O-β-d-galactopyranosyl glycerol (6). These belong to four major classes of natural compounds: bi-flavonoids (1–3); biglycosidic flavonoids (4); cycloexen-carboxylic acids (5); glycerol-glycolipids (6). To the best of our knowledge, compounds (3–6) were identified for the first time in this study as constituents of A. robusta. Anyway, the majority of these compounds has chemotaxonomic relevance and is mostly in accordance with the current botanical classification of this species. Moreover, they also present several pharmacological properties among which, the antibacterial, anti-inflammatory and protective ones are the most important and may explain why this species is used in the ethnomedicinal field.