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: Effect of lindane on hepatic and brain cytochrome P450s and influence of P450 modulation in lindane induced neurotoxicity .
### Output Text:
Effect of <span class="chemical">lindane</span> on hepatic and brain cytochrome P450s and influence of P450 modulation in <span class="chemical">lindane</span> induced neurotoxicity . 