Methylmalonyl coenzyme A (Methylmalonyl-CoA) is a catabolite of valine, isoleucine, methionine, threonine, odd-chain fatty acids, and cholesterol. Methylmalonyl coenzyme A tetralithium is converted to succinyl-CoA by enzymatic reaction of methylmalonyl-CoA mutase (MCM) with coenzyme vitamin B12[1].