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: We assessed force coordination of the hand in Parkinson ' s disease and its relationship to motor complications of levodopa therapy , particularly to levodopa - induced dyskinesias ( LID ) .
### Output Text:
We assessed force coordination of the hand in Parkinson ' s disease and its relationship to motor complications of <span class="chemical">levodopa</span> therapy , particularly to <span class="chemical">levodopa</span> - induced dyskinesias ( LID ) . 