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: On the contrary , pretreatment with L - NAME ( 500 , 700 and 900 mg / kg , i . p . ) decreased convulsion incidence and severity and prolonged latency time to convulsion following injection with a convulsive dose of lindane ( 8 mg / kg , i . p . ) .
### Output Text:
On the contrary , pretreatment with <span class="chemical">L - NAME</span> ( 500 , 700 and 900 mg / kg , i . p . ) decreased convulsion incidence and severity and prolonged latency time to convulsion following injection with a convulsive dose of <span class="chemical">lindane</span> ( 8 mg / kg , i . p . ) . 