2,2-Dimethyl-1,3-dioxolane-4-carboxylic acid-13C3 is an intermediate for the synthesis of 2,3-DPG-13C3 Sodium Salt (D491993), which is a labeled isotope of 2,3-Diphospho-D-glyceric Acid, a metabolite formed in the metabolomes of normal and sickle cell erythrocytes.