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: EEG analyses showed increase of number and duration of ictal periods in EEG of rats receiving l - arginine prior to lindane and decrease of this number in rats pretreated with L - NAME .
### Output Text:
EEG analyses showed increase of number and duration of ictal periods in EEG of rats receiving <span class="chemical">l - arginine</span> prior to <span class="chemical">lindane</span> and decrease of this number in rats pretreated with <span class="chemical">L - NAME</span> . 