A Conformationally Restricted Aspartic Acid Analogue with a Norbornane Skeleton. II

In (1S,2R,3S,4R)-3-benzamido-3-methoxycarbonylbicyclo[2.2.1]heptane-2-carboxylic acid, C 17 H 19 NO 5 , the values determined for the torsion angles about the N-C α (φ) and C α -CO(ψfi) bonds correspond to a semi-extended conformation of the amino acid residue. The crystal structure is stabilized by two intermolecular hydrogen bonds (O-H...O and N-H...O) involving the benzamido, carboxylic acid and methyl ester groups.