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: L - Dopa ( 5 mg / kg i . v . ) decreased blood pressure and heart rate after extracerebral decarboxylase inhibition with MK - 486 ( 25 mg / kg i . v . ) in anesthetize MAO - inhibited dogs .
### Output Text:
<span class="chemical">L - Dopa</span> ( 5 mg / kg i . v . ) decreased blood pressure and heart rate after extracerebral decarboxylase inhibition with <span class="chemical">MK - 486</span> ( 25 mg / kg i . v . ) in anesthetize <span class="chemical">MAO</span> - inhibited dogs . 