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: A 52 - year - old Chinese man reported with liver damage , which appeared 12 hours after beginning treatment with fluvastatin .
### Output Text:
A 52 - year - old Chinese man reported with liver damage , which appeared 12 hours after beginning treatment with <span class="chemical">fluvastatin</span> . 