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: In the epileptic group , the increase in VE was mediated by a significant ( p < 0 . 05 ) decrease in TE peak compared with the control group .
### Output Text:
In the epileptic group , the increase in VE was mediated by a significant ( p < 0 . 05 ) decrease in TE peak compared with the control group . 