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 effects of carbamazepine ( CBZ ) treatment on local anesthetic - kindled seizures and lethality were evaluated in different stages of the kindling process and under different methods of CBZ administration .
### Output Text:
The effects of <span class="chemical">carbamazepine</span> ( <span class="chemical">CBZ</span> ) treatment on local anesthetic - kindled seizures and lethality were evaluated in different stages of the kindling process and under different methods of <span class="chemical">CBZ</span> administration . 