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: The compound manifests antiarrhythmic activity in all models of experimental arrhythmia used , causing greatest inhibition on the arrhythmia induced by chloroform - adrenaline ( in 90 per cent ) and with BaCl2 ( in 84 per cent ) .
### Output Text:
The compound manifests antiarrhythmic activity in all models of experimental arrhythmia used , causing greatest inhibition on the arrhythmia induced by <span class="chemical">chloroform</span> - <span class="chemical">adrenaline</span> ( in 90 per cent ) and with <span class="chemical">BaCl2</span> ( in 84 per cent ) . 