盾叶薯蓣中甾体皂苷及其体外血小板活性研究(2)
3 结构鉴定化合物1 白色无定形粉末。ESI-MS m/z 1 225.6[M-H]-。1H-NMR(C5D5N,600 MHz)δ:0.88(3H,s,H-18),1.05(3H,s,H-19),1.31(3H,d,J=6.6 Hz,H-21),1.02(3H,d,J=6.6 Hz,H-27),4.91(1H,J=7.2,Glc1-H-1),6.22(1H,br s,Rha-H-1),5.07(1H,d,J=7.8 Hz,Glc2-H-1),5.28(1H,d,J=7.8 Hz,Glc3-H-1),4.81(1H,d,J=7.8 Hz,Glc4-H-1),4.06(1H,m,H-26a),3.48(1H,dd,J=9.0,6.0 Hz,H-26b);13C-NMR(C5D5N,150 MHz)δ:37.5(C-1),30.2(C-2),78.3(C-3),39.0(C-4),140.9(C-5),121.9(C-6) ......
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