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 results of this case report support the idea that in contrast with carbamazepine oxcarbazepine does not induce the hepatic microsomal enzyme systems regulating the inactivation of antipsychotic drugs .
### Output Text:
The results of this case report support the idea that in contrast with <span class="chemical">carbamazepine</span> <span class="chemical">oxcarbazepine</span> does not induce the hepatic microsomal enzyme systems regulating the inactivation of antipsychotic drugs . 