Figure 2: X-ray structure of (S)-1a.
From: Engineering chiral porous metal-organic frameworks for enantioselective adsorption and separation

(a) The coordination mode of the L1 ligand. (b) The infinite Mn carboxylate chain. (c) Four metal-carboxylate chains linked by the L1 ligands forming a 41 helical channel. (d) View of the three-dimensional porous structure of (S)-1a along the c axis (the Mn atoms are shown in polyhedra). (Mn, green; O, red; N, purple; C, blue).