Compound 3 (C43H68OI6) was suggested to be a
spirostanol saponin closely related to 2 from its spectral
data. It only differed from 2 in the presence of an
exomethylene group [6H 4.80 and 4.77 (each br s);
6c 144.5 (C) and 108.6 (CH2)] instead of the C-27
secondary methyl group, and the ~H NMR shifts due
to the exomethylene protons and the ~3C NMR signals
due to the spiroacetal moiety (E and F ring parts) of
3 were in good agreement with those of 1. The structure
of 3 was assigned as 5ct-spirost-25(27)-ene-1 fl,3~tdiol
1-O-{O-ct-L-rhamnopyranosyl-(1 ---, 2)-O-[fl-Dxylopyranosyl-(
1 --. 3)]-fl-D-xylopyranoside}.