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: METHODS : Male albino Swiss mice were treated sub - chronically ( twice a day for 4 days ) with L - NOARG ( 40 mg / kg i . p . ) or haloperidol ( 1 mg / kg i . p . ) .
### Output Text:
METHODS : Male albino Swiss mice were treated sub - chronically ( twice a day for 4 days ) with <span class="chemical">L - NOARG</span> ( 40 mg / kg i . p . ) or <span class="chemical">haloperidol</span> ( 1 mg / kg i . p . ) . 