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: Logistic regression analysis revealed that infusion time was significant ( p = 0 . 0004 ; odds ratio = 0 . 974 ) and increasing the IP infusion time of bupropion HCl 120 mg / kg was associated with a 91 % reduced odds of convulsions at infusion times of 15 to 90 min compared to bolus injection .
### Output Text:
Logistic regression analysis revealed that infusion time was significant ( p = 0 . 0004 ; odds ratio = 0 . 974 ) and increasing the IP infusion time of <span class="chemical">bupropion HCl</span> 120 mg / kg was associated with a 91 % reduced odds of convulsions at infusion times of 15 to 90 min compared to bolus injection . 