Studies on the constituents of solanaceous plants. XIII. A new steroidal glucuronide from chinese Solanum lyratum.

A new glucuronide, (22R)-3β, 16β, 22, 26-tetrahydroxycholest-5-ene 3-O-α-L-rhamnopyranosyl-(1→2)-β-D-gluc-uronopyranoside (1), was isolated from the aerial parts of Chinese Solanum lyratum THUNB. The structure of this new steroidal glucuronide was deduced by spectroscopic means and the identity of its aglycone was substantiated by comparison with an authentic sample derived from diosgenin acetate.