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: Induction of apoptosis by remoxipride metabolites in HL60 and CD34 + / CD19 - human bone marrow progenitor cells : potential relevance to remoxipride - induced aplastic anemia .
### Output Text:
Induction of apoptosis by <span class="chemical">remoxipride</span> metabolites in HL60 and CD34 + / CD19 - human bone marrow progenitor cells : potential relevance to <span class="chemical">remoxipride</span> - induced aplastic anemia . 