This study is a continuation of a research program aimed at identifying potent drugs against bacterial infections, in which a series of organic compounds: dicarboxylic acid imides and thioimides, isoquinoline derivatives and open chain compounds, were examined for antimicrobial properties against Staphylococcus auneus and Escheiichia coli. In effect of this investigation, the most active compounds (35-40, 47) were selected for in vitiv tests against fourteen clinically important pathogenic isolates, the methicillin resistant Staphylococcus aueus (MRSA) and several reference Gram-negative bacteria: Prteus vulgaris, Pseudomonas aeruginosa, Klebsiella pneumonia, Stenonophoinonas inaltophilia, and Acinetobacter baumannii. The obtained data revealed that seven compounds (three dithioimides, 35, 39, 47, and four thioimides, 36-38, 40) exhibit effective antibacterial activity against the tested Staphylococcus auirus MSSA and MRSA strains. Among them, dicarboxylic acid thioimides 37 and 38 were proven to be the most active.

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