New class of bicyclic compounds derived from thiobarbituric acid with representative compound 1,3-diethyl-7-hydroxy-5,5,7-trimethyl-2-thioxo-1,2,3,5,6,7-hexahydro-4H-pyrano[2,3-d]pyrimidin-4-one. Preparation, crystal structure, mass spectrometry and IR spectroscopy / N. N. Golovnev, M. S. Molokeev, I. V. Sterkhova [et.al.] // Journal of molecular structure. 2015. Vol. 1102. P. 101-107. URL: http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000552002