title: 2-Ethyl 4-methyl 5-ethyl-3-methyl-1H-pyrrole-2,4-dicarboxyl-ate.
abstract: The title pyrrole derivative compound, C(12)H(17)NO(4), was synthesized from methyl 3-oxopenta-noate by a Knorr-type reaction and contains a pyrrole ring to which two diagonal alk-oxy-carbonyl groups and two diagonal alkyl substituents are attached. The methyl-carbonyl and ethyl-carbonyl substituents are approximately co-planar with the pyrrole ring, making dihedral angles of 5.64 (2) and 3.44 (1)°, respectively. In the crystal, adjacent mol-ecules are assembled by pairs of N-H⋯O hydrogen bonds into dimers in a head-to-head mode.
authors.affiliation: School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013,  People's Republic of China.
authors.forename: Gui-Fen
authors.initials: GF
authors.lastname: Lu
authors.forename: Min
authors.initials: M
authors.lastname: Zhu
authors.forename: Wei-Hua
authors.initials: WH
authors.lastname: Zhu
authors.forename: Zhong-Ping
authors.initials: ZP
authors.lastname: Ou