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: Attenuated disruption of prepulse inhibition by dopaminergic stimulation after maternal deprivation and adolescent corticosterone treatment in rats .
### Output Text:
Attenuated disruption of prepulse inhibition by dopaminergic stimulation after maternal deprivation and adolescent <span class="chemical">corticosterone</span> treatment in rats . 