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To study the Amaryllidaceae alkaloids of the bulbs of Lycoris radiata. The chemical constituents were isolated and purified by various chromatographic techniques, and the chemical structures were elucidated on the basis of spectroscopic methods. In addition, the antiviral activities of alkaloids 1–10 were evaluated using flu virus A. One new homolycorine-type alkaloid 2α-methoxy-6-O-ethyloduline...
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