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Two new lignans named neourticol A (1) and neourticol B (2), together with seven known compounds (3–9), were isolated from Urticae Fissae Herba, a folk medicine for rheumatism arthritis in China. The active evaluation results showed that 1 and 2 possessed the potent anti-complement and anti-inflammatory activities.
The authors are really grateful to Dr. Bona Dai of the Instrumental Analysis Center of Shanghai Jiao Tong University, for the measurements of NMR.
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