[3-(5-Hy­droxy-5H-dibenzo[a,d]cyclo­hepten-5-yl)prop­yl]dimethyl­ammonium 3-carboxyprop-2-enoate

Abstract

In the cation of the title salt, C20H24NO+·C4H3O4 −, the N atom in the dimethyl­ammonium group is protonated. The dihedral angle between the mean planes of the two six-membered rings fused to the cyclo­hepten-5-yl ring is 54.4 (1)°. An intra­molecular O—H⋯O hydrogen bond occurs in the anion. The crystal packing is stabilized by inter­molecular O—H⋯O and N—H⋯(O,O) hydrogen bonds and weak C—H⋯O inter­actions, forming a two-dimensional network