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: Myopathy , defined as muscle symptoms with creatine kinase elevations greater than 10 times the upper limit of normal , was rare and associated with the highest recommended daily dose of lovastatin ( 80 mg ) .
### Output Text:
Myopathy , defined as muscle symptoms with <span class="chemical">creatine</span> kinase elevations greater than 10 times the upper limit of normal , was rare and associated with the highest recommended daily dose of <span class="chemical">lovastatin</span> ( 80 mg ) . 