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: Coenzyme Q10 treatment ( 10 mg / kg / day , i . p . ) was applied for 6 consecutive days , starting 1 day before cisplatin administration .
### Output Text:
<span class="chemical">Coenzyme Q10</span> treatment ( 10 mg / kg / day , i . p . ) was applied for 6 consecutive days , starting 1 day before <span class="chemical">cisplatin</span> administration . 