A member of the class of cobalamins that is vitamin B12 in which the cyano group is replaced by a 5'-deoxyadenos-5'-yl moiety. It is one of the two metabolically active form of vitamin B12. ChEBI: Cobamamide is a member of the class of cobalamins that is vitamin B12 in which the cyano group is replaced by a 5'-deoxyadenos-5'-yl moiety. It is one of the two metabolically active form of vitamin B12. It has a role as a coenzyme, a human metabolite, an Escherichia coli metabolite, a cofactor and a prosthetic group. It is a member of cobalamins and a corrinoid.