华中枸骨叶的化学成分及其肿瘤细胞毒作用(3)
化合物8 无色针晶(氯仿+甲醇),mp 229~231 ℃。1H-NMR(CDCl3,400 MHz)δ:0.77,0.93,0.97,0.98,1.08(各3H,s,H-23~27),0.78(3H,d,J=6.0 Hz,H-30),0.91(3H,d,J=6.0 Hz,H-29),5.20(1H,t,J=4.0 Hz,H-12),3.20(1H,dd,J=10.8,4.8 Hz,H-3),3.51(1H,d,J=10.8 Hz,H-28a),3.17(1H,d,J=10.8 Hz,H-28b); 13C-NMR(CDCl3,100 MHz)δ: 38.8(C-1),27.2(C-2),79.2(C-3),38.8(C-4),55.1(C-5),18.3(C-6),32.8(C-7) ......
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