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: Is Dysguesia Going to be a Rare or a Common Side - effect of Amlodipine ?
### Output Text:
Is Dysguesia Going to be a Rare or a Common Side - effect of <span class="chemical">Amlodipine</span> ? 