title: (E)-3-{[([1,1'-Biphen-yl]-3-ylmeth-yl)iminium-yl]meth-yl}-6,8-di-chloro-2H-chromen-4-olate.
abstract: In the crystal of the title compound, C23H17Cl2NO2, the H atom of the -OH group is transferred to the N atom of the imine, forming a zwitterion. This results in a six-membered intra-molecular O⋯H-N hydrogen-bonded ring, rather than that formed with an O-H⋯N hydrogen bond. The dihedral angle between the rings of the biphenyl unit is 13.88 (10)°. In the crystal, mol-ecules are linked by N-H⋯O and C-H⋯O inter-actions.
authors.affiliation: School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan.
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Ishikawa
authors.affiliation: School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan.
authors.forename: Yuya
authors.initials: Y
authors.lastname: Motohashi