2-(3'-Bromoanilino)-5-[5'-amino-1'-(4"-chlorophenyl)-1',2',3'- triazol-4'-yl]-1,3,4-thiodiazole was prepared by 1-[5'-amino-1'-(4"- chlorophenyl)-1',2',3'-triazol-4'-yl]-4-(3'-bromophenyl)-3- thiosemicarbazides with concentrated sulfuric acid. The single crystalline structure of the new compound was determined by X-ray analysis. The crystal is triclinic system, space group P1, with a=1.1784(2), b=1.4455(2), c =1.1353(1)nm, α=100.68(1), β=109.50(1), γ=79.89(1)°, V=17779nm^3, C~1~6H~1~1BrClN~7S, Mr=448.75, Dc=1.673g/cm^3, Z=4, μ=58.16cm^-^1. The final R=0.084, Rw=0.086. This molecule is a structure of conjugated π-bond from analyzing the data of the bond distance and bond angle.

Key words: CRYSTAL STRUCTURE, X-RAY DIFFRACTION ANALYSIS, THIADIAZOLE P, HETEROCYCLIC COMPOUNDS, PYRRODIAZOLE P