茯苓的化学成分研究(2)
化合物2 白色粉末,mp 272~275 ℃ 。ESI-(+)-MS m/z 507[M+Na]+。IR(KBr)νmax:1 706cm-1。1H-NMR(pyridine-d5,300 MHz)δ:5.62(1H,br s,H-7),5.39(1H,m,H-11),4.83,4.97 (各1H,s,H-31),4.53(1H,m,H-16),3.45(1H,d,J=7.2 Hz,H-3),1.42(3H,s,H-30),1.18(3H,s,H-18),1.09(3H,s,H-29),1.07 (3H,s,H-19),1.01(3H,s,H-18),0.99,0.96(各3H,d,J=7.5 Hz,H-26,27);13C-NMR (pyridine-d5 ......
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