An isotope labeled derivative of Methylmalonic Acid , binds with coenzyme A to form methylmalonyl-CoA, also a metabolic intermediate transformed to succinic acid (SA) by a vitamin B12-dependent catalytic step, and is broadly used as a clinical biomarker of functional vitamin B12 status.Form:White to Off-White SolidMelting Point:133-135°CSolubility:DMSO, Methanol