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: This drug was initiated in association with paroxetine and dosulepine hydrochloride in a tetraparetic patient with chronic pain .
### Output Text:
This drug was initiated in association with <span class="chemical">paroxetine</span> and <span class="chemical">dosulepine hydrochloride</span> in a tetraparetic patient with chronic pain . 