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: CONCLUSIONS : GLS combined with cTnT may provide a reliable and non - invasive method to predict cardiac dysfunction in patients receiving anthracycline - based chemotherapy .
### Output Text:
CONCLUSIONS : GLS combined with cTnT may provide a reliable and non - invasive method to predict cardiac dysfunction in patients receiving <span class="chemical">anthracycline</span> - based chemotherapy . 