1,4,7,10-Tetra­kis(carbamoylmeth­yl)-1,4,7,10-tetra­azacyclo­dodecane

The centrosymmetric title compound, C₁₆H₃₂N₈O₄, crystallizes one half-molecule in the asymmetric unit. Single crystals were grown from water and, even though the compound contains hydrogen-bonding groups, no water mol­ecules of crystallization were found. Two of the four pendant arms form intra­molecularly hydrogen bonds to preorganize the compound into a shape similar to that required for ligation.