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: RESULTS : L - NOARG sub - chronic administration produced tolerance of L - NOARG and of haloperidol - induced catalepsy .
### Output Text:
RESULTS : <span class="chemical">L - NOARG</span> sub - chronic administration produced tolerance of <span class="chemical">L - NOARG</span> and of <span class="chemical">haloperidol</span> - induced catalepsy . 