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In this study six unsymmetrical thiourea derivatives, 1-isobutyl-3-cyclohexylthiourea ( 1 ), 1- tert- butyl-3-cyclohexylthiourea ( 2 ), 1-(3-chlorophenyl)-3-cyclohexylthiourea ( 3 ), 1-(1,1-dibutyl)-3-phenylthiourea ( 4 ), 1-(2-chlorophenyl)-3-phenylthiourea ( 5 ) and 1-(4-chlorophenyl)-3-phenylthiourea ( 6 ) were obtained in the laboratory under aerobic conditions. Compounds 3 and 4 are crystalline and their structure was determined for their single crystal. Compounds 3 is monoclinic system with space group P2 1 /n while compound 4 is trigonal, space group R 3 :H . Compounds ( 1 - 6 ) were tested for their anti-cholinesterase activity against acetylcholinesterase and butyrylcholinesterase (hereafter abbreviated as, AChE and BChE, respectively). Potentials (all compounds) as sensing probes for determination of deadly toxic metal (mercury) using spectrofluorimetric technique were also investigated. Compound 3 exhibited better enzyme inhibition IC 50 values of 50, and 60 µg/mL against AChE and BChE with docking score of -10.01, and -8.04 kJ/mol, respectively. The compound also showed moderate sensitivity during fluorescence studies.

Thiourea Derivatives, Simple in Structure but Efficient Enzyme Inhibitors and Mercury Sensors