蕷知子為木通科木通屬植物木通、三葉木通、白木通的種子。自白木通Akebiatrifoliata（Thunb.）Koidz.var.austrais（Diels）Rehd.的種子中首次分出2種3位單糖鏈皂甙化合物，經(jīng)¹HNMR、¹³CNMR、²DNMR、結合水解等方法鑒定了它們的結構。Ⅰ為常春藤皂甙元3-O-β--D-吡喃木糖-（1→2）-α-L-吡喃阿拉伯糖甙（即saponinB）；Ⅱ為常壽藤皂甙元-3-O-β-D-吡喃葡萄糖-（1→2）-α-L-吡喃阿拉伯糖甙（即saponinC）。

Yuzhizi is the seed of Akebia quinata (Thunb. ), A.trifoliota (Thunb.) Koidz.and A.trifoliata(Thunb.) Koidz.var.australis(Diels) Rehd.Two triterpenoid saponins of hederagenin 3-O-glycosides have been isolated from the seeds of A. trijoliata (Thunb.) Koidz.var.australis (Diels) Rehd. for the first time. They were idcntified by spectroscopic(EI-MS, FABMS, 1H, 13CNMR and 2 DNMR) and chemical methods (acid/base hydrolysis) as Ⅰ:3-O-β-D-xylo-pyranosyl-(1-2)-α-L-arabinopyranoside hederagenin (saponin B); Ⅱ: hederagenin 3-O-β-D-glucopyranosyl-(1-2)-α-L-arabinopyranoside (saponin C).