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: The baby showed warfarin - induced embryopathy with nasal hypoplasia and stippled epiphyses ( chondrodysplasia punctata ) .
### Output Text:
The baby showed <span class="chemical">warfarin</span> - induced embryopathy with nasal hypoplasia and stippled epiphyses ( chondrodysplasia punctata ) . 