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: In a double blind , crossover study 6 h infusions of adrenaline ( 15 ng / kg / min ; 1 ng = 5 . 458 pmol ) , noradrenaline ( 30 ng / kg / min ; 1 ng = 5 . 911 pmol ) , and a 5 % dextrose solution ( 5 . 4 ml / h ) , were given to ten healthy volunteers in random order 2 weeks apart .
### Output Text:
In a double blind , crossover study 6 h infusions of <span class="chemical">adrenaline</span> ( 15 ng / kg / min ; 1 ng = 5 . 458 pmol ) , <span class="chemical">noradrenaline</span> ( 30 ng / kg / min ; 1 ng = 5 . 911 pmol ) , and a 5 % <span class="chemical">dextrose</span> solution ( 5 . 4 ml / h ) , were given to ten healthy volunteers in random order 2 weeks apart . 