CRYSTAL STRUCTURES AND SUPRAMOLECULAR FEATURES OF 9,9-DIMETHYL-3,7-DIAZABICYCLO[3.3.1]NONANE-2,4,6,8-TETRAONE, 3,7-DIAZASPIRO[BICYCLO[3.3.1]NONANE-9,1-CYCLOPENTANE]-2,4,6,8-TETRAONE AND 9-METHYL-9-PHENYL-3,7-DIAZABICYCLO[3.3.1]NONANE-2,4,6,8-TETRAONE DIMETHYLFORMAMIDE MONOSOLVATE Статья Vatsadze S.Z., Manaenkova M.A., Vasilev E.V., Venskovsky N.U., Khrustalev V.N. Acta Crystallographica Section E: Crystallographic Communications. International Union of Crystallography. 2017.