3,5-difenil 1,2,4-triazol halkası içeren 1,2,4-triazolo-tiyadiazol türevlerinin sentezi ve biyolojik aktivitelerinin incelenmesi The synthesis and investigation of biological activities of 1,2,4-triazolo-thiadiazole derivatives containing 3,5-difenyl 1,2,4-triazole ring