瑶药糯米风醇提物的化学成分研究(4)
化合物Ⅹ:黄色粉末(甲醇),mp:225~226 ℃。分子式:C21H20O12,ESI-MS:m/z 465[M+H]+。1H-NMR(CD3OD,500 MHz)δ:6.19(1H,d,J=1.8 Hz,6-OH),6.38(1H,d,J=1.8 Hz,8-OH),7.54(1H,d,J=1.8 Hz,H-2′),6.82(1H,d,J=8.2 Hz,H-5′),7.66(1H,dd,J=8.2,2.0 Hz,H-6′),5.22(1H,d,J=7.3 Hz,H-1″)。13C-NMR(CD3OD,125 MHz)δ:157.1(C-2),135.7(C-3),179.2(C-4),160.5(C-5),100.5(C-6),166.3(C-7),94.3(C-8),158.2(C-9),105.5(C-10),123.3(C-1′),116.2(C-2′),145.6(C-3′),150.1(C-4′),117.9(C-5′),123.7(C-6′),104.3(C-1″),72.9(C-2″),75.2(C-3″),70.5(C-4″),77.3(C-5″),61.8(C-6″) ......
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