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: Bromocriptine - induced hypotension was unaffected by isoproterenol pretreatment , while tachycardia was reversed to significant bradycardia , an effect that was partly reduced by i . v . domperidone ( 0 . 5 mg / kg ) .
### Output Text:
<span class="chemical">Bromocriptine</span> - induced hypotension was unaffected by <span class="chemical">isoproterenol</span> pretreatment , while tachycardia was reversed to significant bradycardia , an effect that was partly reduced by i . v . <span class="chemical">domperidone</span> ( 0 . 5 mg / kg ) . 