有哪些信誉好的足球投注网站Four pregnane glycosides, boucerosides AI, AII, BI and BII, from Boucerosia aucheriana》.pdfVIP
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Four pregnane glycosides, boucerosides AI, AII, BI and BII, from Boucerosia aucheriana》.pdf
Phytochemistry,Vol. 27,No. 12,pp. 3919-3924,1988. 88$3.00+0.00 Printed in Great Britain. 0 1988Pergamon Press plc. FOUR PREGNANE GLYCOSIDES, BOUCEROSIDES AI, AII, BI AND BII, FROM BOUCEROSIA AUCHERIANA* KOJI HAYASHI*, IKUKO IIDA, YUMIKO NAKAO, YOSHIHIRO NAKAO and KOH KANEKO Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo 060, Japan (Receioed 7 April 1988) Key Word Index-Boucerosia aucheriana; Asclepiadaceae; pregnane glycoside; boucerosides AI, AII, BI, and BII; 2,6-dideoxy sugar. Abstract-Four new glycosides were isolated from Boucerosia aucheriana. The structures of boucerosides Al, All, Bl, and Bll were deduced on the basis of chemical and spectral evidence as boucerogenin 1 3-O+D-glucopyranosyl- (l-+4)-6-deoxy-3-0-methyl-/?-D-allopyranosyl-( 1-4)~p-D-oleandropyranosyl-( 1+4)-b-D-cymaropyranoside, boucer- II 3-0-P-D-glucopyranosyl-( l-+4)-6-deoxy-3-0-methyl-B-D-allopyranosyl-(1 +4)-B-D-oleandropyranosyl- ~~~~B-D-cymaropyranoside, boucerogenin 1 3-0-/?-D-glucopyranosyl-( 1+4)-6-deoxy-3-O-methyl-fi-D-allopyrano- syl-( 1-+4)-b-D-cymaropyranosyl-( l-4)-p-D-cymaropyranoside, and boucerogenin II 3-o-fl-D-ghCOpyranOSyl-( l-4)- 6-deoxy-3-0-methyl-B-D-allopyranosyl-( 1-+4)-~-D-cymaropyranosyl-(1+4)-~-D-cymaropyranoside,
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