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 purpose of this study was to evaluate the neurologic consequences of deliberate subarachnoid injection of large volumes of 2 - chloroprocaine - CE in experimental animals .
### Output Text:
The purpose of this study was to evaluate the neurologic consequences of deliberate subarachnoid injection of large volumes of <span class="chemical">2 - chloroprocaine - CE</span> in experimental animals . 