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: In contrast , the L - arginine treatment increased the incidence of lidocaine ( 80 mg / kg , i . p . ) - induced convulsions significantly .
### Output Text:
In contrast , the <span class="chemical">L - arginine</span> treatment increased the incidence of <span class="chemical">lidocaine</span> ( 80 mg / kg , i . p . ) - induced convulsions significantly . 