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Isolation of Tetraprenyltoluquinols from the Brown Alga <i>Sargassum thunbergii</i>
Seo, Youngwan,Park, Ki Eui,Kim, You Ah,Lee, Hee-Jung,Yoo, Jong-Su,Ahn, Jong-Woong,Lee, Burm-Jong The Pharmaceutical Society of Japan 2006 Chemical & pharmaceutical bulletin Vol.54 No.12
<P>Thunbergols A (4) and B (5), tetraprenyltoluquinols, along with three known compounds (1—3) have been isolated from the brown alga <I>Sargassum thunbergii</I>. The structures of these two new compounds were determined to be 9-(3,4-dihydro-2,8-dimethyl-6-hydroxy-2<I>H</I>-1-benzopyran-2-yl)-6-methyl-2-(4-methyl-3-pentenyl)-(2<I>E</I>,6<I>E</I>)-nonadienoic acid (4) and 10-(2,3-dihydro-5-hydroxy-7-methyl-1-benzofuran-2-yl)-10-hydroxy-6-methyl-2-(4-methyl-3-pentenyl)-(2<I>E</I>,6<I>E</I>)-undecadienoic acid (5), respectively, by combined spectroscopic methods. Both of them exhibited significant scavenging activities on radical and potently inhibited generation of ONOO<SUP>−</SUP> from morpholinosydnonimine (SIN-1).</P>