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 the present study , cis - platin ( 80 - 120 mg / m2BSA ) and 5 - FU ( 1000 mg / m2BSA daily as a continuous infusion during 5 days ) were given to 76 patients before radiotherapy and surgery .
### Output Text:
In the present study , <span class="chemical">cis - platin</span> ( 80 - 120 mg / m2BSA ) and <span class="chemical">5 - FU</span> ( 1000 mg / m2BSA daily as a continuous infusion during 5 days ) were given to 76 patients before radiotherapy and surgery . 