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 data strengthen the evidence that the neurotoxic effect of amphetamine and related compounds toward nigrostriatal dopamine neurons involves NMDA receptors and that LY274614 is an NMDA receptor antagonist with long - lasting in vivo effects in rats .
### Output Text:
The data strengthen the evidence that the neurotoxic effect of <span class="chemical">amphetamine</span> and related compounds toward nigrostriatal <span class="chemical">dopamine</span> neurons involves <span class="chemical">NMDA</span> receptors and that <span class="chemical">LY274614</span> is an <span class="chemical">NMDA</span> receptor antagonist with long - lasting in vivo effects in rats . 