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: The EDITS scores were 67 . 4 ( 10 . 2 ) for the bupropion and 36 . 3 ( 11 . 7 ) for the placebo group ( P = 0 . 001 ) .
### Output Text:
The EDITS scores were 67 . 4 ( 10 . 2 ) for the <span class="chemical">bupropion</span> and 36 . 3 ( 11 . 7 ) for the placebo group ( P = 0 . 001 ) . 