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: Her neuropathy stabilized and showed slight improvement and ultimately received an unrelated , reduced - intensity allogeneic transplant while in complete remission , but relapsed disease 10 weeks later .
### Output Text:
Her neuropathy stabilized and showed slight improvement and ultimately received an unrelated , reduced - intensity allogeneic transplant while in complete remission , but relapsed disease 10 weeks later . 