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: Blood pressure response to chronic low - dose intrarenal noradrenaline infusion in conscious rats .
### Output Text:
Blood pressure response to chronic low - dose intrarenal <span class="chemical">noradrenaline</span> infusion in conscious rats . 