E. Bunuel et al., A CONFORMATIONALLY RESTRICTED ASPARTIC-ACID ANALOG WITH A NORBORNANE SKELETON .2., Acta crystallographica. Section C, Crystal structure communications, 53, 1997, pp. 626-628
In -methoxycarbonylbicycIo[2.2.1]heptane-2-carboxylic acid, C17H19NO5,
the values determined for the torsion angles about the N-C-alpha(psi)
and C-alpha-CO psi) 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.