title: 3,5-Bis(ethoxy-carbon-yl)-2,6-dimethyl-1,4-dihydro-pyridine-4-carboxylic acid.
abstract: The title mol-ecule, C(14)H(19)NO(6), was synthesized by the reaction of glyoxylic acid, ethyl acetoacetate and NH(4)HCO(3). In the crystal structure, the dihydro-pyridine ring adopts an asymmetric boat-type conformation with the C atom bearing the carboxyl group showing a signficantly larger deviation [0.325 (2) Å] from the base plane then the N atom [0.137 (2) Å]. One of the ethyl groups is disordered over two positions with occupancies of 0.741 (10) and 0.259 (10). The crystal is stabilized by strong inter-molecular hydrogen bonds. N-H⋯O inter-actions form infinite chains in the a direction. O-H⋯O hydrogen bonds form typical carboxylic acid dimers, which link the N-H⋯O chains into a ladder-type double chain.
authors.affiliation: Ordered Matter Science Research Center, College of Chemistry and Chemical Engineering, School of Materials Science and Engineering, Southeast University, Nanjing 210096, People's Republic of China.
authors.forename: De-Hong
authors.initials: DH
authors.lastname: Wu
authors.forename: Ling
authors.initials: L
authors.lastname: Hu