Acid hydrolysis ofl. A soln of 1 (25 mg) in M HC1
(dioxane-H20, 1 : 1, 5 ml) was heated at 100 ° for 1 hr
under an Ar atmosphere. After cooling, the reaction
mixt. was neutralized by passing it through an Amberlite
IRA-93ZU (Organo) column and chromatographed
on silica gel eluting with a gradient mixt.
of CHCI3-MeOH (19:1; 1:1) to give an aglycone (la)
(3.4 mg) and a mixt. of monosaccharides (11.5 mg).