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 effects of N - nitro - L - arginine - methyl ester ( L - NAME ) a nitric oxide ( NO ) synthase inhibitor and L - arginine , a NO precursor , were investigated on lidocaine - induced convulsions .
### Output Text:
The effects of <span class="chemical">N - nitro - L - arginine - methyl ester</span> ( <span class="chemical">L - NAME</span> ) a <span class="chemical">nitric oxide</span> ( <span class="chemical">NO</span> ) synthase inhibitor and <span class="chemical">L - arginine</span> , a <span class="chemical">NO</span> precursor , were investigated on <span class="chemical">lidocaine</span> - induced convulsions . 