title: meso-(1S*,21R*)-25-Methyl-8,11,14-trioxa-22,24,25-triaza-tetra-cyclo-[19.3.1.0(2,7).0(15,20)]penta-cosa-2,4,6,15(20),16,18-hexa-ene-23-thione chloro-form monosolvate.
abstract: The title compound crystallizes as a chloro-form solvate, C(20)H(23)N(3)O(3)S·CHCl(3), with two crystallographically independent units. The independent units have distinctly different inter-action patterns between the aza-crown macrocycle and the chloro-form solvent mol-ecule. In one of them, the chloro-form mol-ecule forms C-H⋯N and Cl⋯H-C hydrogen bonds with the aza-crown macrocycle (as a proton donor and an acceptor, respectively), whereas in the other, one of the chloro-form mol-ecules is bound to the aza-crown macrocycle by an attractive Cl⋯O [3.080 (3) Å] inter-action. The aza-crown macrocycles of different units are structurally similar; the aza-14-crown-3-ether ring adopts a bowl conformation with dihedral angles between the planes of the fused benzene rings of 60.7 (1) and 68.0 (1)°. The triazinane-thione ring in both cases has a sofa conformation. The crystal packing is characterized by N-H⋯S, N-H⋯O, C-H⋯Cl and C-H⋯S hydrogen bonds.
authors.affiliation: Department of Chemistry, Vietnam National University, 144 Xuan Thuy, Cau Giay, Hanoi,  Vietnam.
authors.forename: Truong Hong
authors.initials: TH
authors.lastname: Hieu
authors.forename: Le Tuan
authors.initials: le T
authors.lastname: Anh
authors.forename: Anatoly T
authors.initials: AT
authors.lastname: Soldatenkov
authors.forename: Vladimir V
authors.initials: VV
authors.lastname: Kurilkin
authors.forename: Victor N
authors.initials: VN
authors.lastname: Khrustalev