N,N′-substituted dithiooxamides derived from alkyl-α-amino acids or from glycylglycine: acid dissociation properties in aqueous solution and crystal and molecular structures of N,N′-bis(carboxymethyl) dithiooxamide (GLYDTO) and N,N′-bis(1-carboxyethyl) dithiooxamide (ALADTO) | Publicación