Crystal structure of dimethyl N,N'-[(ethyne-1,2-di-yl)bis-(1,4-phenyl-enecarbon-yl)]bis-(l-alaninate)

The di-phenyl-ethyne unit of the title mol-ecule, C₂₄H₂₄N₂O₆, deviates slightly from planarity. The l-alanine moieties adopt distorted helical conformations of opposite winding direction. Infinite ribbons of N-H⋯O=C-connected mol-ecules represent the basic supra-molecular entities of the crystal structure. These aggregates are linked by C-H⋯O hydrogen bonds involving the oxygen atoms of the methyl carboxyl-ate units. The crystal studied was refined as an inversion twin.