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: Hypotension induced by both peptides was significantly attenuated by glibenclamide , which abolished a levcromakalim - produced decrease in arterial blood pressure .
### Output Text:
Hypotension induced by both peptides was significantly attenuated by <span class="chemical">glibenclamide</span> , which abolished a <span class="chemical">levcromakalim</span> - produced decrease in arterial blood pressure . 