In the sentence extracted from biomedical literature, identify all the chemical entities. The required answer format is the same sentence with HTML <span> tags to mark up specific entities. 
### Entity Markup Guides:
Use <span class="chemical"> to denote a chemical.

### Input Text: 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 .
### Output Text:
The aim of the experiment was to evaluate the developmental toxicity of the non - selective ( <span class="chemical">piroxicam</span> ) and selective ( <span class="chemical">DFU</span> ; <span class="chemical">5 , 5 - dimethyl - 3 - ( 3 - fluorophenyl ) - 4 - ( 4 - methylsulphonyl ) phenyl - 2 ( 5H ) - furanon</span> ) COX - 2 inhibitors . 