6-RNH- and 6-R2NNH-pyrazine-2-carbothioamides 1--3, 5, 6, 9 and 14 were obtained from 2-cyano-6-chloropyrazine. In the in vitro screening the thioamides were active against Myc. tuber. H37Rv at the conc. range of 15.6--250 microgram/cm3. The most active thioamides 1 and 8, however, do not act in experimental tuberculosis in guinea pigs.
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