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: We describe a female patient with stable Parkinson ' s disease who has shown a marked worsening of her motor functions following therapy of menopause related symptoms with veralipride , as well as the improvement of her symptoms back to baseline after discontinuation of the drug .
### Output Text:
We describe a female patient with stable Parkinson ' s disease who has shown a marked worsening of her motor functions following therapy of menopause related symptoms with <span class="chemical">veralipride</span> , as well as the improvement of her symptoms back to baseline after discontinuation of the drug . 