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: RESULTS : LAG consisted of 75 patients ( 46 % ) versus 88 HAG patients ( 54 % ) .
### Output Text:
RESULTS : LAG consisted of 75 patients ( 46 % ) versus 88 HAG patients ( 54 % ) . 