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: CONCLUSIONS : Etoricoxib 90 mg demonstrated a significantly lower risk for discontinuing treatment due to GI AEs compared with diclofenac 150 mg .
### Output Text:
CONCLUSIONS : <span class="chemical">Etoricoxib</span> 90 mg demonstrated a significantly lower risk for discontinuing treatment due to GI AEs compared with <span class="chemical">diclofenac</span> 150 mg . 