A new series of N,S-substituted 4-chloro-2-mercapto-5-methylbenzenesulfonamide derivatives 12-15, 17, 18 and 20-24 have been synthesized as potential anti-HIV agents. All compounds were screened at the National Cancer Institute (Bethesda, USA) for their in vitro anti-HIV-1 activity, and relationships between structure and anti-HIVactivity are discussed. The prominent compounds with remarkable activity were [5-chloro- 4-methyl-2-(1H-pyrrol-1-ylsulfonyl)phenylthio]acetamide 22 (EC50 = 5.9 _M) and 4-bromophenyl 5-chloro-4-methyl-2-(1H-pyrrol-1-ylsulfonyl)phenylthiomethyl ketone 4-phenylsemicarbazone 24 (EC50 = 5.1 mi M).
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