title: 3,4-Bis(4-meth-oxy-phen-yl)-2,5-dihydro-1H-pyrrole-2,5-dione.
abstract: In the title compound, C(18)H(15)NO(4), the benzene rings form quite different dihedral angles [16.07 (1) and 59.50 (1)°] with the central pyrrole ring, indicating a twisted mol-ecule. Conjugation is indicated between the five- and six-membered rings by the lengths of the C-C bonds which link them [1.462 (3) and 1.477 (3) Å]. The most prominent feature of the crystal packing is the formation of inversion dimers via eight-membered {⋯HNCO}(2) synthons.
authors.affiliation: College of Science, Northwest A&F University, Yangling, Shaanxi 712100,  People's Republic of China.
authors.forename: Liangzhu
authors.initials: L
authors.lastname: Huang
authors.forename: Youqiang
authors.initials: Y
authors.lastname: Li
authors.forename: Dongmei
authors.initials: D
authors.lastname: Gao
authors.forename: Zhenting
authors.initials: Z
authors.lastname: Du