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: A 14 - year - old girl is reported with recurrent , azithromycin - induced , acute interstitial nephritis .
### Output Text:
A 14 - year - old girl is reported with recurrent , <span class="chemical">azithromycin</span> - induced , acute interstitial nephritis . 