title: 6-Amino-5-(1-amino-2,2-dicyano-vin-yl)-3,3a,4,5-tetra-hydro-2H-indene-4-spiro-1'-cyclo-pentane-3a,7-dicarbonitrile-thio-phene-2-carbaldehyde (1/0.5).
abstract: In each of the two independent indene-4-spiro-pentane mol-ecules in the asymmetric unit of the title 2:1 adduct, C(19)H(18)N(6)·0.5C(5)H(4)OS, the cyclo-hexene ring adopts a half-chair conformation and the cyclo-pentene and cyclo-pentane rings adopt envelope conformations. The mean plane through the cyclo-hexene/cyclo-pentene fused system is aligned at a dihedral angle of 77.9 (1)° with respect to the mean plane through the cyclo-pentane ring in one mol-ecule and 87.0 (1)° in the other. In the crystal, adjacent indene-4-spiro-pentane mol-ecules are linked by N-H⋯N hydrogen bonds into a three-dimensional network. The spaces within the network are occupied by the thio-phene-2-carbaldehyde mol-ecules. The thio-phene-2-carbaldehyde unit is disordered over two positions of equal occupancy. The crystal studied was found to be a non-morohedral twin with two minor twin components of 18.4 and 9.7%.
authors.forename: Abdullah M
authors.initials: AM
authors.lastname: Asiri
authors.forename: Seik Weng
authors.initials: SW
authors.lastname: Ng