A new iridoid glycoside from the root of Psychotria rubra

Phytochemical investigation on the root of Psychotria rubra led to the isolation of two iridoid glycosides (1, 4), two flavones (2-3). To our knowledge, all compounds were isolated from this plant for the first time. Compound 1 (psyrubrin A) was a new compound, and compounds 2-4 were reported for the first time from the genus Psychotria. The chemotaxonomic significances of these compounds were summarized.