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: Furthermore , transient hemoglobinuria was noted approximately 60 minutes postinjection of WR242511 ( 3 . 5 or 7 . 0 mg / kg ) , and 2 lethalities occurred ( one IV and one PO ) following the 7 . 0 mg / kg dose .
### Output Text:
Furthermore , transient hemoglobinuria was noted approximately 60 minutes postinjection of <span class="chemical">WR242511</span> ( 3 . 5 or 7 . 0 mg / kg ) , and 2 lethalities occurred ( one IV and one PO ) following the 7 . 0 mg / kg dose . 