N-Acetylglycyl-L-lysine methyl ester acetate

Abstract

C _llH₂₂ N₃0₄⁺. C₂H₃0₂^-, orthorhombic, P2₁2₁2₁, a = 5.511(2), b = 14.588(4), c = 21.109 (4) Å , Z = 4. The structure has been solved using Multan and refined to R = 0.079 for 993 observed reflections. The fully extended lysine side chain in the molecule is staggered between the main-chain amino and carbonyl groups. The dipeptide molecules in the crystal structure are arranged in twofold helices centred on 2₁ screw axes. These helices are interconnected through interactions involving the acetate and the side-chain amino groups. Each acetate group bridges two adjacent side-chain amino groups, related by an a translation, giving rise to an infinitely long chain of alternating negatively charged carboxylate and positively charged amino groups.