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: Extrapyramidal symptoms reported as AEs occurred in 15 % and 18 % , 34 % , and 10 % of the asenapine at 5 and 10 mg BID , haloperidol , and placebo groups , respectively .
### Output Text:
Extrapyramidal symptoms reported as AEs occurred in 15 % and 18 % , 34 % , and 10 % of the <span class="chemical">asenapine</span> at 5 and 10 mg BID , <span class="chemical">haloperidol</span> , and placebo groups , respectively . 