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The aim of this paper was to determine the chemical structure of cis/trans isomers of vitamin K2MK-7 found in dietary supplements. Vitamin K2MK-7 was extracted, along with contamination in the form of cis/trans isomers of menaquinone-7, from dietary supplements through tetrahydrofuran and then subjected to fractionation using the semi-preparative chromatography column with cholesteryl group phase...
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