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Fifty six compounds of 4-methylthiosemicarbazone and thiocarbohydrazone derivatives were prepared and subjected to biological tests. The following five compounds, 2-hydroxybenzaldehyde monothiocarbohydrazone (2),4-methylbenzaldehyde monothiocarbohydrazone (8), 1-(2-hydroxybenzaldehyde)-5-(4-hydroxy-3-methoxybenzaldehyde) dithiocarbohydrazone (45), 1-(2-hydroxybenzaldehyde)-5-furfural dithiocarbohydrazone (46) and 1-benzaldehyde-5-cinnamaldehyde dithiocarbohydrazone (49) exhibited marked antimicrobial activity against E. coli, St. aureus and P. chrysogenum. In addition to these compounds, 3-methoxybenzaldehyde monothiocarbohydrazone (12) and 4-methylbenzaldehyde dithiocarbohydrazone (29) showed marked inhibition of HeLa cell growth at the concentration of l0mcg/ml. It was generally observed that most compounds demonstrated significant antifungal activity against P. chrysogenum but only one compound, 3-hydroxy-4-methoxybenzaldehyde dithiocarbohydrazone (39), exerted antituberculosis activity against M.tuberculosis H37RV at the concentration of 10mcg/ml.
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