红花龙胆化学成分研究(3)
化合物12 无色油状(氯仿),Liebermann-Burchard反应呈阳性,mp 129~131 ℃。1H-NMR(CDCl3,300 MHz)δ: 5.19(1H,t,H-12),4.50(1H,dd,J=8.8,7.1 Hz,H-3),3.54(1H,d,J=10.9 Hz,H-28α),3.21(1H,d,J=10.9 Hz,H-28β),2.29(2H,t,J=7.4,7.6 Hz,H-2),1.10 (3H,s,H-27),0.99 (3H,s,H-26),0.96 (3H,s,H-25),0.94 (3H,s,H-29),0.87~0.89 (9H,s,H-23,24, 16′); 13C-NMR(CDCl3,75 MHz) δ:144.2(C-13) ......
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