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: He was admitted with acute myopathy of the lower limbs which resolved in a few days after pravastatin discontinuation .
### Output Text:
He was admitted with acute myopathy of the lower limbs which resolved in a few days after <span class="chemical">pravastatin</span> discontinuation . 