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: Both the temporal relationship of events and the response to treatment suggest that a rapid systemic absorption of mepivacaine with adrenaline and / or interaction of these drugs with the patient ' s cardiovascular medications were responsible for the perioperative complications .
### Output Text:
Both the temporal relationship of events and the response to treatment suggest that a rapid systemic absorption of <span class="chemical">mepivacaine</span> with <span class="chemical">adrenaline</span> and / or interaction of these drugs with the patient ' s cardiovascular medications were responsible for the perioperative complications . 