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: However , DA response was lost if a 9 - month long haloperidol - induced hyperprolactinemia was followed by a 1 1 / 2 month - long extremely high increase in serum PRL levels produced by implantation of MMQ cells under the kidney capsule .
### Output Text:
However , <span class="chemical">DA</span> response was lost if a 9 - month long <span class="chemical">haloperidol</span> - induced hyperprolactinemia was followed by a 1 1 / 2 month - long extremely high increase in serum PRL levels produced by implantation of MMQ cells under the kidney capsule . 