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: AMN082 ( 2 . 5 and 5 mg / kg ) reduces apomorphine - induced rotations in unilateral 6 - hydroxydopamine ( 6 - OHDA ) - lesioned rats .
### Output Text:
<span class="chemical">AMN082</span> ( 2 . 5 and 5 mg / kg ) reduces <span class="chemical">apomorphine</span> - induced rotations in unilateral <span class="chemical">6 - hydroxydopamine</span> ( <span class="chemical">6 - OHDA</span> ) - lesioned rats . 