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: METHODS : In this study , WR242511 was administered intravenously ( IV ) in 2 female and 4 male rhesus monkeys in doses of 3 . 5 and / or 7 . 0 mg / kg ; a single male also received WR242511 orally ( PO ) at 7 . 0 mg / kg .
### Output Text:
METHODS : In this study , <span class="chemical">WR242511</span> was administered intravenously ( IV ) in 2 female and 4 male rhesus monkeys in doses of 3 . 5 and / or 7 . 0 mg / kg ; a single male also received <span class="chemical">WR242511</span> orally ( PO ) at 7 . 0 mg / kg . 