title: Crystal structure of anagyrine perchlorate.
abstract: The title mol-ecular salt, C15H21N2O(+)·ClO4 (-), crystallizes with four cations (A, B, C and D) and four anions in the chiral unit cell (space group P21). The alkaloid was isolated from the aerial parts of Genista Hispanica collected in the Samarkand region of Uzbekistan. Each cation is protonated at the N atom that bridges the alkaloid rings C and D. In each cation, ring A is almost planar and ring B adops a sofa conformation with the methyl-ene group bridging to the C ring as the flap. Rings C and D adopt chair conformations with a cis ring junction in all four cations. In the crystal, A+B and C+D dimeric pairs linked by pairs of N-H⋯O hydrogen bonds are observed, which generate R 2 (2)(16) loops in each case. The dimers are consolidated by weak aromatic π-π stacking inter-actions between the A rings [centroid-centroid distances = 3.913 (3) and 3.915 (3) Å].
authors.affiliation: S. Yunusov Institute of the Chemistry of Plant Substances, Academy of Sciences of Uzbekistan, Mirzo Ulugbek Str. 77, Tashkent 100170, Uzbekistan.
authors.forename: Kambarali K
authors.initials: KK
authors.lastname: Turgunov
authors.affiliation: S. Yunusov Institute of the Chemistry of Plant Substances, Academy of Sciences of Uzbekistan, Mirzo Ulugbek Str. 77, Tashkent 100170, Uzbekistan.
authors.forename: Shukhrat B
authors.initials: SB
authors.lastname: Rakhimov
authors.affiliation: S. Yunusov Institute of the Chemistry of Plant Substances, Academy of Sciences of Uzbekistan, Mirzo Ulugbek Str. 77, Tashkent 100170, Uzbekistan.
authors.forename: Valentina I
authors.initials: VI
authors.lastname: Vinogradova
authors.affiliation: S. Yunusov Institute of the Chemistry of Plant Substances, Academy of Sciences of Uzbekistan, Mirzo Ulugbek Str. 77, Tashkent 100170, Uzbekistan.
authors.forename: Bakhodir
authors.initials: B
authors.lastname: Tashkhodjaev
keywords: Genista Hispanica; N—H⋯O hydrogen bonds; alkaloid; anagyrine; crystal structure; perchlorate; π–π stacking inter­actions