Crystal structure of (3R)-3-benzyl-4-[(tert-but­oxy­carbon­yl)amino]­butanoic acid

The characteristic feature of the title mol­ecule, C₁₆H₂₃NO₄, is the syn configuration of the partially double amide C—N bond [C—N—C—O torsion angle = −14.8 (2)°]. The crystal packing is determined by inter­molecular O—H...O and N—H...O hydrogen bonds, which link the mol­ecules into a double-chain structure extending along [010].