Vadadustat-13C6 (PG-1016548-13C6) is 13C labeled Vadadustat. Vadadustat (PG-1016548) is a titratable, oral hypoxia-inducible factor prolyl hydroxylase (HIF-PH) inhibitor[1]. Vadadustat is an erythropoiesis-stimulating agent and has the potential for anemia treatment in chronic kidney disease in vivo[1][2].