OBJECTIVE: To investigate the chemical constituents of Pistia stratiotes, a kind of duckweed. METHOD: Compounds were separated by chromatography on sillica gel, and their structures were identified by spectral analysis and chemical evidence. RESULT: Four compounds were obtained and identified as stigmasta-4,22-dien-3-one, stigmasterol, stigmasteryl stearate and palmitic acid. CONCLUSION: All the four compounds were isolated from this plant for the first time.
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