河北医科大学药学院2018 Is this already known or not H-NMR 02202102 Is this already known or not?? 量目是目期 ；野；捌 13C-NMR 天然药物化学教研室史清文教授 3河北医科大学药学院2018 天然药物化学教研室史清文教授 3 Is this already known or not ? 1H-NMR Is this already known or not?? 13C-NMR