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ETHNOPHARMACOLOGICAL RELEVANCE Qing Dai, a famous traditional Chinese medicine (TCM), is prepared by a traditional fermentation process with the aerial part of Strobilanthes cusia. Currently, this TCM could treat various clinical inflammatory diseases, such as ulcerative colitis and psoriasis, however, the bioactive components of Qing Dai are unknown clearly. AIM OF THE STUDY To isolate and identify the anti-IL-17A components of Qing Dai. MATERIALS AND METHODS Silica, RP-18 gels, and size exclusion resin were used for column chromatograp