.beta.-D-Glucopyranoside, (3.beta.,22.alpha.,25R)- 26-(.beta.-D-glucopyranosyloxy)-22-methoxyfurost- 5-en-3-yl O-6-deoxy-.alpha.-L-mannopyranosyl- (1.fwdarw.2)-O-[.beta.-D-glucopyranosyl- (1.fwdarw.3)]- 1H-Naphth[2',1':4,5]indeno[2,1-b]furan,.beta.-D-glucopyranoside derivative Furostan, .beta.-D-glucopyranoside derivative Kikubasaponin Methyl protogracillin NSC698792