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: Efficacy and tolerability of lovastatin in 3390 women with moderate hypercholesterolemia .
### Output Text:
Efficacy and tolerability of <span class="chemical">lovastatin</span> in 3390 women with moderate hypercholesterolemia . 