ChEBI: Hydrogenphosphate is a phosphate ion that is the conjugate base of dihydrogenphosphate. It has a role as a Saccharomyces cerevisiae metabolite and a cofactor. It is a divalent inorganic anion and a phosphate ion. It is a conjugate base of a dihydrogenphosphate. It is a conjugate acid of a phosphate(3-).