Abstract New arylhydrazone derivatives and a series of 1, 5-diphenyl pyrazoles were designed and synthesized from 1-(4-chlorophenyl)-4, 4, 4-trifuorobutane-1, 3-dione 1. The newly synthesized compounds were investigated in vivo for their anti-inflammatory activities using carrageenan-induced rat paw oedema model. Moreover, they were tested for their inhibitory activity against ovine COX-1 and COX-2 using an in vitro cyclooxygenase (COX) ...