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: Also , reflex bradycardia was produced in rats by intravenous infusion of adrenaline ( 1 . 25 - 2 . 5 micrograms kg - 1 ) .
### Output Text:
Also , reflex bradycardia was produced in rats by intravenous infusion of <span class="chemical">adrenaline</span> ( 1 . 25 - 2 . 5 micrograms kg - 1 ) . 