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: Bupropion HCl was infused through a surgically implanted IP dosing catheter with infusions in each group of 0 min , 15 min , 30 min , 60 min , 90 min , 120 min , and 240 min .
### Output Text:
<span class="chemical">Bupropion HCl</span> was infused through a surgically implanted IP dosing catheter with infusions in each group of 0 min , 15 min , 30 min , 60 min , 90 min , 120 min , and 240 min . 