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: Immediately after the administration of levobupivacaine 0 . 5 % with epinephrine 2 . 5 microgram / mL , the patients developed grand mal seizures , despite negative aspiration for blood and no clinical signs of intravenous epinephrine administration .
### Output Text:
Immediately after the administration of <span class="chemical">levobupivacaine</span> 0 . 5 % with <span class="chemical">epinephrine</span> 2 . 5 microgram / mL , the patients developed grand mal seizures , despite negative aspiration for blood and no clinical signs of intravenous <span class="chemical">epinephrine</span> administration . 