摘要:
Five new acylated glucosides of okanin, okanin 4-O-(6"-O-acetyl-2"-O-caffeoyl-β-D-glucopyranoside, okinin 4-O-(2"-O-caffeoyl-6"-O-p-coumaroyl-β-D-glucopyranoside), 4-O-methylokanin 4'-O-(6"-O-p-coumaroyl-β-D-glucopyranoside, 4-O-methylokanin 4'-O-(6"-O-acetyl-β-D-glucopyranoside), 4-O-methylokanin 4'-O-(6'-O-acetyl-2"-O-caffeoyl-β-D-glucopyranosid), have been isolated from the fresh leaves of Bidens frondosa. These structures have been elucidated on the basis of spectral data and chemical correlation.