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To study the chemical constituents of Macleaya cordata (Willd.) R. Br. Crude alkaloids were isolated and purified from the fruits with column chromatography of cation exchange, silica gel ad Sephadex LH-20 followed by recrystallization. The structure elucidation was carried out by extensive spectroscopic methods. Two new benzophenanthridine isoquinoline alkaloids, 6a-iso-butanonyldihydrosanguinarine...
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