桂花的化学成分研究(7)
化合物21淡黄色粉末(氯仿);1H-NMR(CDCl3,500 MHz)δ:6.58(1H,d,J=9.6 Hz,H-7),6.04(1H,d,J=9.6 Hz,H-6),5.75(1H,s,H-4),5.25(2H,m,H-22,23),1.07(3H,d,J=7.1 Hz,21-CH3),0.98(3H,d,J=6.6 Hz,19-CH3),0.98(3H,s,18-CH3),0.94(3H,d,J=6.6 Hz,28-CH3),0.86(3H,d,J=7.0 Hz,27-CH3),0.84(3H,d,J=7.1Hz ......
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