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: A history of angioedema secondary to lisinopril therapy was elicited .
### Output Text:
A history of angioedema secondary to <span class="chemical">lisinopril</span> therapy was elicited . 