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6Investigation of Nitrogen- and Sulfur-containing Heterocycles. 53. Reactions of 5-Amino-6-mercaptopyrimidines with Derivatives of p-Chloronitrobenzene. Synthesis of a New Heterocyclic System - Pyrimido[4,5-b]-1,4-benzothiazepine, Chemistry of Heterocyclic Compounds Nitrogen- and sulfur -containing heterocycles, Chemistry of Heterocyclic Compounds Amino-derivatives of 4-methoxy-7,8-dihydro-1,3-diazaphenothiazine and their neurotropic activity, Pharmaceutical Chemistry Journal Synthesis and antitumor activity of 5-acylamino-6-mercaptopyrimidine derivatives, Pharmaceutical Chemistry Journal Heterocycles containing nitrogen and sulfur. Part 49. Synthesis of derivatives of new heterocyclic systems: 1,2-Dioxocyclopenta(hexa)[g]oxazolidino-[3,2-f] pyrimido[4,5-b][1,4]thiazine, 1,2-dioxocyclopenta(hexa)-[g] imidazolidino[3,2-f]pyrimido[4,5-b][1,4]thiazine, and 1,2-oxazino[5,4-g]pyrimidino[4,5-b][1,4]thiazine, Chemistry of Heterocyclic Compounds Synthesis and antitumor activity of pyrimido[4,5-b][1,4]thiazin-6-one-7-acetic acid derivatives, Pharmaceutical Chemistry Journal