(±)-Equol 4’-sulfate is a gut-mediated phase II metabolite of the isoflavonoid phytoestrogen (±)-equol .[1] It has been used as a standard for the quantification of unconjugated equol in rat plasma.[2]
D-erythrose 4-sodium phosphate is the sodium phosphate of the monosaccharide erythrose. Erythritol is actually converted to D-erythrose 4-phosphate involving three isomerases.