A new sesquiterpenoid hydroquinone 2 and three new sesquiterpenoid quinones 4, 5 and 6 were isolated from the Okinawan marine sponge, Dysidea sp., together with the known hydroquinone 1 and its corresponding quinone 3. The structures of these compounds were elucidated on the basis of spectroscopic data and chemical reactions.
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Iguchi et al. (1990) studied this question.
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