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: No abnormal matrical inclusions of peroxisomes were formed in the cells of hyperplastic nodules by ethyl - alpha - p - chlorophenoxyisobutyrate unlike in the case of rats .
### Output Text:
No abnormal matrical inclusions of peroxisomes were formed in the cells of hyperplastic nodules by <span class="chemical">ethyl - alpha - p - chlorophenoxyisobutyrate</span> unlike in the case of rats . 