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 : The incidence of EPS - related adverse events , including akathisia , was no different with quetiapine monotherapy ( 12 . 9 % ) than with placebo ( 13 . 1 % ) .
### Output Text:
RESULTS : The incidence of EPS - related adverse events , including akathisia , was no different with <span class="chemical">quetiapine</span> monotherapy ( 12 . 9 % ) than with placebo ( 13 . 1 % ) . 