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 patient ' s maximal temperature was 101 . 2 F and his CPK remained < 500 units / L with no other evidence of rhabdomyolysis .
### Output Text:
The patient ' s maximal temperature was 101 . 2 F and his CPK remained < 500 units / L with no other evidence of rhabdomyolysis . 