羊耳菊化学成分研究(5)
化合物10白色粉末(甲醇)。ESI-MS m/z 491.5 [M+Na]+;1H-NMR(CDCl3,500 MHz) δ: 5.13(1H,m,H-24),4.74,4.71(each 1H,br s,H-21),4.48(1H,dd,J=5.0,16.6 Hz,H-3),2.04(3H,s,Ac),1.69,1.62(each 3H,br s,CH3-26,27),0.97,0.87,0.86,0.85,0.85(each 3H,s,CH3-18,19,28,29,30);13C-NMR(CDCl3,125 MHz) δ: 38.8(C-1) ......
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