title: Dimethyl 2,6-dimethyl-1,4-dihydro-pyridine-3,5-dicarboxyl-ate.
abstract: In the crystal of the title compound, C(11)H(15)NO(4), the mol-ecules are linked into sheets by N-H⋯O and C-H⋯O hydrogen bonds. Within the mol-ecule, the 1,4-dihydro-pyridine ring exhibits a distinctive planar conformation [r.m.s. deviation from the mean plane of 0.009 (3)Å], and the other non-H atoms are almost coplanar [r.m.s. deviation = 0.021 (3) Å] with the 1,4-dihydro-pyridine ring. The conformation of the latter is governed mainly by two intra-molecular C-H⋯O non-classical inter-actions.
authors.forename: Zhenfeng
authors.initials: Z
authors.lastname: Zhang
authors.forename: Dong
authors.initials: D
authors.lastname: Xian
authors.forename: Jiange
authors.initials: J
authors.lastname: Wang
authors.forename: Guisheng
authors.initials: G
authors.lastname: Zhang