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: Future studies are needed to assess the therapeutic potential emerging from our finding for human W - ICH .
### Output Text:
Future studies are needed to assess the therapeutic potential emerging from our finding for human W - ICH . 