tokens: The aim of the experiment was to evaluate the developmental toxicity of the non - selective ( piroxicam ) and selective ( DFU ; 5 , 5 - dimethyl - 3 - ( 3 - fluorophenyl ) - 4 - ( 4 - methylsulphonyl ) phenyl - 2 ( 5H ) - furanon ) COX - 2 inhibitors .