New Chalcones from Bidens pilosa.

: Okanin 4'- O-beta- D-(2'',4'',6''-triacetyl)-glucoside, okanin 4'- O-beta- D-(6''- TRANS-P-coumaroyl)-glucoside, both new natural compounds, and okanin 3'- O-beta- D-glucoside have been isolated from the leaves of BIDENS PILOSA L. Their structures have been elucidated by means of UV, FD-MS, (1)H-NMR, and (13)C-NMR spectroscopy. NMR spectral data for okanin 4'- O-beta- D-glucoside (marein) are given.