title: 4-(4-Chloro-phen-yl)-3-cyano-7-(4-meth-oxy-phen-yl)-5-oxo-5,6,7,8-tetra-hydro-4H-chromen-2-aminium methano-late.
abstract: In the cation of the title organic ion pair compound, C(23)H(20)ClN(2)O(3) (+)·CH(3)O(-), the cyclo-hexyl ring shows a half-boat conformation and the dihedral angles between two benzene rings and the pyran ring are 83.14 (7) and 73.18 (9)°. In the crystal, centrosymmetrically related cations are linked into a dimer by pairs of N-H⋯N hydrogen bonds, generating an R(2) (2)(12) ring motif. The anion inter-acts with the dimer through an N-H⋯O hydrogen bond. π-π inter-actions between pyran rings of adjacent dimers, with a centroid-centroid distance of 3.861 (2) Å, are also observed.
authors.forename: Rong
authors.initials: R
authors.lastname: Sun
authors.forename: Ke
authors.initials: K
authors.lastname: Wang
authors.forename: Dong-Dong
authors.initials: DD
authors.lastname: Wu
authors.forename: Wei
authors.initials: W
authors.lastname: Huang
authors.forename: Yang-Bing
authors.initials: YB
authors.lastname: Ou