The title compound, (C15H25N2O)[FeCl4], consists of one matrinium cation {matrine is (7aS,13aR,13bR,13cS)-dodecahydro-1H,5H,8H-dipyrido[2,1-f:3′,2′,1′-ij][1,6]-naphthyridin-10-one} and one [FeCl4]− anion. One ring of the matrinium cation has a half-chair conformation, whereas the others have chair conformations. Chiral chains of the title compound are formed by C—H⋯O and N—H⋯O hydrogen bonds.
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Jin et al. (2005) studied this question.