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 administration of L - arginine ( 600 , 800 and 1000 mg / kg , i . p . ) in dose - dependent manner significantly increased convulsion incidence and severity and shortened latency time to first convulsion elicited by lower lindane dose ( 4 mg / kg , i . p . ) .
### Output Text:
The administration of <span class="chemical">L - arginine</span> ( 600 , 800 and 1000 mg / kg , i . p . ) in dose - dependent manner significantly increased convulsion incidence and severity and shortened latency time to first convulsion elicited by lower <span class="chemical">lindane</span> dose ( 4 mg / kg , i . p . ) . 