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: In addition , there is convincing clinical evidence that monotherapy with continuous subcutaneous apomorphine infusions is associated with marked reductions of preexisting levodopa - induced dyskinesias .
### Output Text:
In addition , there is convincing clinical evidence that monotherapy with continuous subcutaneous <span class="chemical">apomorphine</span> infusions is associated with marked reductions of preexisting <span class="chemical">levodopa</span> - induced dyskinesias . 