New hydrolysable tannin from Cibotium barometz(3)
Compound 3 were characterized as protocatechualdehyde by comparison of their NMR spectroscopic data with the literature values[15].The structural assignment was further supported by HPLC-ESI-MS with compound 1 at tR = 3.55 min (m/z 340.9 [M-H]- ).Compound 1A colorless solid.HR-ESI-MSm/z 342.095 6[M+H]+ (calcd.for C15H19O9 ......
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