FIELD: organic chemistry. SUBSTANCE: invention describes novel derivatives of 5-oxo-5H-[1]-benzopyrano-[5,6-b]-4-oxo-[1,2]- -pyrimido-1,4,5,6-tetrahydro-1,3-thiazine of the formula (I) 
where R1 is H or halogen atom; R2 is H or halogen atom or nitro-group or hydroxy-group or methoxy-group showing antibacterial activity. These derivatives can be used in medicine for treatment of patients with tuberculosis and other viral diseases and diseases accompanying with immunodeficiency. EFFECT: new compounds indicated above, valuable medicinal properties. 11 cl, 11 tbl, 4 ex
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