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: The effects of N , N ' - dibenzhydrylethane - 1 , 2 - diamine dihydrochloride ( AMN082 ) , the first selective allosteric activator of mGlu7 receptors , were thus tested in different rodent models of PD .
### Output Text:
The effects of <span class="chemical">N , N ' - dibenzhydrylethane - 1 , 2 - diamine dihydrochloride</span> ( <span class="chemical">AMN082</span> ) , the first selective allosteric activator of mGlu7 receptors , were thus tested in different rodent models of PD . 