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: The acute observations included hazy sensorium , superior gaze palsy , pupillary abnormalities , and conjunctival hemorrhages with edema .
### Output Text:
The acute observations included hazy sensorium , superior gaze palsy , pupillary abnormalities , and conjunctival hemorrhages with edema . 