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2s,3s,5r,6r -5,6-bis hydroxymethyl -2,3-dimethoxy-2,3-dimethyl-1,4-dioxane; 95% - kupit' online v internet-magazine chimmed  https://chimmed.ru/products/2s3s5r6r-56-bishydroxymethyl-23-dimethoxy-23-dimethyl-14-dioxane-95-id=4410436