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A new quinone was isolated from the thermophilic methane-oxidizing bacterium strain H-2; was eluted after ubiquinone-8 on reversed-phase high-performance liquid chromatography (HPLC). Proton-magnetic resonance spectroscopy revealed that one of the isoprene units of a side chain was changed to 4-methyl-3-isopentene. The position of the substituted isoprene unit was localized by MS/MS spectrometry. The new quinone was identified as 2,3-dimethoxy-5-methyl-6-geranylgeranyl- [4-methyl-3-isopentenyl]-farnesyl-1,4-benzoquinone.
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Támaoka et al. (1985) studied this question.
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