Oxymatrinium tetra­chloridoferrate(III)

The asymmetric unit of the title compound, (C₁₅H₂₅N₂O₂)[FeCl₄], contains a tetra­chloridoferrate(III) anion and a oxymatrinium cation [oxymatrine is (4R,7aS,13aR,13bR,13cS)-dodeca­hydro-1H,5H,10H-dipyrido[2,1-f:3′,2′,1′-ij][1,6]naphthyridin-10-one 4-oxide]. The conformation of oxymatrine is similar to that of matrine with one ring having a half-chair conformation, while the others have chair conformations. Chiral chains of cations along the c axis are formed by O—H...O hydrogen bonds.