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organic compounds
Molecules of the interesting racemic 3,3-diphenylalanine derivative, C18H19NO4, contain a DIP amino acid residue which adopts a semi-extended conformation. The values of φ and ψ are −91.0 (5) and 130.4 (4)°, respectively, for the L enantiomer. The crystal structure consists of cyclic (urethane)N—HO=C(methyl ester) hydrogen-bonded dimers piled up in columns running parallel to the crystallographic a axis.