title: Ethyl (2Z)-3-oxo-2-(3,4,5-tri-meth-oxy-benzyl-idene)butano-ate.
abstract: In the title compound, C16H20O6, the conformation about the C=C double bond [1.344 (2) Å] is Z. With respect to this bond, the ketone is almost coplanar [C-C-C-O torsion angle = -179.60 (10)°] and the ester is almost perpendicular [C-C-C-O = 78.42 (13)°]. The meth-oxy substituents of the central benzene ring are either almost coplanar [C-C-O-C = 3.54 (15) and 177.70 (9)°] or perpendicular [C-C-O-C = 80.08 12)° for the central substituent]. In the crystal, the three-dimensional architecture features C-H⋯O and π-π [inter-centroid distance = 3.6283 (6) Å] inter-actions.
authors.affiliation: Department of Chemistry, Universidade Federal de São Carlos, 13565-905 São Carlos, SP, Brazil.
authors.forename: Julio
authors.initials: J
authors.lastname: Zukerman-Schpector
authors.affiliation: Department of Chemistry, Universidade Federal de São Carlos, 13565-905 São Carlos, SP, Brazil.
authors.forename: Camila Lury
authors.initials: CL
authors.lastname: Hino
authors.affiliation: Instituto de Química, Universidade Estadual de Campinas, CP 6154, 13083-970 Campinas, SP, Brazil.
authors.forename: Paulo J S
authors.initials: PJ
authors.lastname: Moran
authors.affiliation: Instituto de Química, Universidade Estadual de Campinas, CP 6154, 13083-970 Campinas, SP, Brazil.
authors.forename: Bruno R S
authors.initials: BR
authors.lastname: de Paula
authors.affiliation: Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia ; Chemistry Department, Faculty of Science, King Abdulaziz University, PO Box 80203 Jeddah, Saudi Arabia.
authors.forename: Seik Weng
authors.initials: SW
authors.lastname: Ng
authors.affiliation: Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia.
authors.forename: Edward R T
authors.initials: ER
authors.lastname: Tiekink