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: AIDA in doses of 7 . 5 - 15 microg / 0 . 5 microl diminished the haloperidol - induced muscle rigidity .
### Output Text:
<span class="chemical">AIDA</span> in doses of 7 . 5 - 15 microg / 0 . 5 microl diminished the <span class="chemical">haloperidol</span> - induced muscle rigidity . 