This is the first time that it is from its roots, which were collected at Vi Xuyen district - Ha Giang province, were five compounds isolated. These compounds include two phenylethanoid glycosides, verbascoside (1), arenarioside (2); one iridoid glucoside, myxopyroside (3); one indole, 3-formylindole (4), and one furfural, 5-hydroxymethyl furfural (5). Their chemical structures were determined by ESI-MS, 1D-, 2D-NMR spectroscopic data analysis as well as in comparison with those reported in the literatures. |
