title: 1-(2-Hy-droxy-eth-yl)-4-{3-[(E)-2-(trifluoro-meth-yl)-9H-thioxanthen-9-yl-idene]prop-yl}piperazine-1,4-diium bis-(3-carb-oxy-prop-2-enoate).
abstract: In the title salt, C(23)H(27)F(3)N(2)OS(+)·2C(4)H(3)O(4) (-), a non-merohedral twin [ratio of the twin components = 0.402 (1):0.598 (1)], the -CF(3) group is disordered over two sets of sites with occupancy factors in the ratio 0.873 (2):0.127 (2). The dihedral angle between the two outer aromatic rings of the 9H-thioxanthene unit, whose thio-pyran ring has a screw-boat conformation, is 33.01 (9)°. The diprotonated piperazine ring adopts a chair conformation. In the crystal, inter-molecular O-H⋯O, N-H⋯O and C-H⋯O hydrogen bonds between neighboring mol-ecules form zigzag chains along the a axis and contribute to the stabilization of the packing.
authors.forename: M S
authors.initials: MS
authors.lastname: Siddegowda
authors.forename: Ray J
authors.initials: RJ
authors.lastname: Butcher
authors.forename: Mehmet
authors.initials: M
authors.lastname: Akkurt
authors.forename: H S
authors.initials: HS
authors.lastname: Yathirajan
authors.forename: A R
authors.initials: AR
authors.lastname: Ramesh
references.citation: Acta Crystallogr A. 2008 Jan;64(Pt 1):112-22
references.pmid: 18156677
references.citation: Acta Crystallogr D Biol Crystallogr. 2009 Feb;65(Pt 2):148-55
references.pmid: 19171970
references.citation: Practitioner. 1981 May;225(1355):761-3
references.pmid: 7291129