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: Oral administration of lindane ( 2 . 5 , 5 , 10 and 15 mg / kg , body weight ) for 5 days was found to produce a dose - dependent increase in the activity of P450 dependent 7 - ethoxyresorufin - O - deethylase ( EROD ) , 7 - pentoxyresorufin - O - dealkylase ( PROD ) and N - nitrosodimethylamine demethylase ( NDMA - d ) in rat brain and liver .
### Output Text:
Oral administration of <span class="chemical">lindane</span> ( 2 . 5 , 5 , 10 and 15 mg / kg , body weight ) for 5 days was found to produce a dose - dependent increase in the activity of P450 dependent 7 - ethoxyresorufin - O - deethylase ( EROD ) , 7 - pentoxyresorufin - O - dealkylase ( PROD ) and <span class="chemical">N - nitrosodimethylamine</span> demethylase ( <span class="chemical">NDMA</span> - d ) in rat brain and liver . 