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Two new hydroxystilbene dimers, named scirpusin A (1) and B (12), were isolated from the rhizoma of Scirpus fluviatilis (TORR.) A. GRAY (Cyperaceae) together with two known hydroxystilbenes, resveratrol and 3, 3', 4, 5'-tetrahydroxystilbene, and four known triterpens, betulin, lupeol, betulinaldehyde and betulinic acid. The structures of scirpusin A and B were elucidated to be 1 and 12, respectively, by chemical and spectral evidence.
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Nakajima et al. (1978) studied this question.
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