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: Reserpine ( 1 mg / kg ) , administered 90 min before the test and followed by apomophine injection ( 0 . 1 mg / kg ) 5 min before the test , did not produce oral dyskinesia in mice .
### Output Text:
<span class="chemical">Reserpine</span> ( 1 mg / kg ) , administered 90 min before the test and followed by <span class="chemical">apomophine</span> injection ( 0 . 1 mg / kg ) 5 min before the test , did not produce oral dyskinesia in mice . 