A group of 4H-1,2,4-triazole-derived thioureas was efficiently prepared and evaluated for antibacterial,
antifungal and antiviral activities.The chemical identity of all derivatives was established on the
basis of spectral methods. The molecular structures of 10 and 21 were determined by an X-ray crystallography.
Compounds with phenyl (1), 3,4-dichlorophenyl (2) and p-methoxyphenyl (3) substituents were the
most promising against fungi species. The derivative 12 has proved to be significantly active against CVB-5.
The CNS-activity of five new 4H-1,2,4-triazolo-thiourea derivatives 2, 10, 12, 18 and 21 was investigated. The results
proved that activity of all tested thiourea compounds may be connected with the serotonergic system. Derivatives 2, 10,
12, 18 acted as inhibitors of the head twitch responses (HTR).The biological activity of 21 was also linked with the endogenous
opioid system. The derivative 18 diminished the spontaneous mobility and 10 reduced the amphetamineinduced
activity of laboratory animals.