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 forestomach , and also in the liver , aspirin did not affect the FANFT - induced increase in labeling index .
### Output Text:
In the forestomach , and also in the liver , <span class="chemical">aspirin</span> did not affect the <span class="chemical">FANFT</span> - induced increase in labeling index . 