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: In addition to fluids , the treatment group received furosemide ( mean dose 110 mg ) intravenously 30 min prior to the injection of contrast material .
### Output Text:
In addition to fluids , the treatment group received <span class="chemical">furosemide</span> ( mean dose 110 mg ) intravenously 30 min prior to the injection of contrast material . 