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: A Cambodian woman with hemoglobin E trait ( AE ) and leprosy developed a Heinz body hemolytic anemia while taking a dose of dapsone ( 50 mg / day ) not usually associated with clinical hemolysis .
### Output Text:
A Cambodian woman with hemoglobin E trait ( AE ) and leprosy developed a Heinz body hemolytic anemia while taking a dose of <span class="chemical">dapsone</span> ( 50 mg / day ) not usually associated with clinical hemolysis . 