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 contrast , levodopa - induced neuropsychiatric - like behaviors were present on Day 1 of levodopa treatment and their severity did not correlate with duration of treatment .
### Output Text:
In contrast , <span class="chemical">levodopa</span> - induced neuropsychiatric - like behaviors were present on Day 1 of <span class="chemical">levodopa</span> treatment and their severity did not correlate with duration of treatment . 