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: The administration of FR 139317 ( 10 mg . kg - 1 . d - 1 ) prevented FK 506 - induced hypertension in rats .
### Output Text:
The administration of <span class="chemical">FR 139317</span> ( 10 mg . kg - 1 . d - 1 ) prevented <span class="chemical">FK 506</span> - induced hypertension in rats . 