title: 2-{3-Cyano-5,5-dimethyl-4-[6-(pyrrol-i-din-1-yl)hexa-1,3,5-trien-yl]-2,5-dihydro-2-furylidene}malononitrile.
abstract: The title compound, C(20)H(20)N(4)O, is packed into a three-dimensional 'herringbone' matrix using two different types of attractive C-H⋯N(cyano) inter-actions. The bond-length alternation, caused by delocalization of charge between the donor N atoms and the cyano acceptor groups, is compared with related compounds.
authors.affiliation: Industrial Research Limited, PO Box 31-310, Lower Hutt, New Zealand.
authors.forename: Graeme J
authors.initials: GJ
authors.lastname: Gainsford
authors.forename: M Delower H
authors.initials: MD
authors.lastname: Bhuiyan
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Kay