Iridoids and anthraquinones from the roots of Morinda officinalis

Three iridoids, asperulosidic acid (1), geniposidic acid (2), and galioside (3) and three anthraquinones, 2-hydroxymethyl-3-hydroxyanthraquinone (4), rubiadin-1-methyl ether (5), and anthragallol-2-methyl ether (6) were isolated from the methanol extract of the Morinda officinalis leaves. Their chemical structures were elucidated by ESI-MS, 1D- and 2D-NMR spectra and comparison with the data reported in the literature. Galioside (3) was reported from Morinda genus for the first time.