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 dorsal root ganglia sensory neurons and , to a lesser extent , satellite cells showed the same changes as those induced by CDDP , mainly affecting the nucleus and nucleolus of ganglionic sensory neurons .
### Output Text:
The dorsal root ganglia sensory neurons and , to a lesser extent , satellite cells showed the same changes as those induced by <span class="chemical">CDDP</span> , mainly affecting the nucleus and nucleolus of ganglionic sensory neurons . 