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: This study aimed at investigating the potential antipsychotic - like properties of SSR103800 , with a particular focus on models of hyperactivity , involving either drug challenge ( ie , amphetamine and MK - 801 ) or transgenic mice ( ie , NMDA Nr1 ( neo - / - ) and DAT ( - / - ) ) .
### Output Text:
This study aimed at investigating the potential antipsychotic - like properties of <span class="chemical">SSR103800</span> , with a particular focus on models of hyperactivity , involving either drug challenge ( ie , <span class="chemical">amphetamine</span> and <span class="chemical">MK - 801</span> ) or transgenic mice ( ie , <span class="chemical">NMDA</span> Nr1 ( neo - / - ) and DAT ( - / - ) ) . 