香血藤中倍半萜类化学成分研究(3)
化合物7 白色针晶(石油醚-乙酸乙酯)。FAB-MS m/z 223 [M+H]+。1H-NMR(CDCl3,400 MHz)δ: 1.84,1.52(各1H,m,H-2),1.66(1H,m,H-10),1.63(1H,m,H-11),1.59,0.51(各1H,m,H-9),1.53,1.37(1H,m,H-3),1.40,0.81(1H,m,H-8),1.28(3H,s,H-15),1.00(1H,m,H-7),0.96(3H,d,J=6.7 Hz,H-12或13),0.93(3H,d,J=6.9 Hz,H-14),0.91(3H,d,J=7.1 Hz,H-13或12),0.86(1H ......
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