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: Study participants were randomized to receive 10 mg of prochlorperazine administered intravenously by means of 2 - minute push ( bolus group ) or 10 mg diluted in 50 mL of normal saline solution administered by means of intravenous infusion during a 15 - minute period ( infusion group ) .
### Output Text:
Study participants were randomized to receive 10 mg of <span class="chemical">prochlorperazine</span> administered intravenously by means of 2 - minute push ( bolus group ) or 10 mg diluted in 50 mL of normal saline solution administered by means of intravenous infusion during a 15 - minute period ( infusion group ) . 