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: These findings suggest that NRA0160 may have unique antipsychotic activities without the liability of motor side effects typical of classical antipsychotics .
### Output Text:
These findings suggest that <span class="chemical">NRA0160</span> may have unique antipsychotic activities without the liability of motor side effects typical of classical antipsychotics . 