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 rat received either alpha - TC ( 20 mg / kg ) intraperitoneally for 3 days and 30 min prior to MA administration or DFO ( 50 mg / kg ) subcutaneously 30 min before MA administration .
### Output Text:
The rat received either <span class="chemical">alpha - TC</span> ( 20 mg / kg ) intraperitoneally for 3 days and 30 min prior to <span class="chemical">MA</span> administration or <span class="chemical">DFO</span> ( 50 mg / kg ) subcutaneously 30 min before <span class="chemical">MA</span> administration . 