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: L - NAME ( 100 mg / kg , i . p . ) and diazepam ( 2 mg / kg ) significantly decreased the incidence of lidocaine ( 50 mg / kg ) - induced convulsions .
### Output Text:
<span class="chemical">L - NAME</span> ( 100 mg / kg , i . p . ) and <span class="chemical">diazepam</span> ( 2 mg / kg ) significantly decreased the incidence of <span class="chemical">lidocaine</span> ( 50 mg / kg ) - induced convulsions . 