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: NRA0160 and clozapine significantly shortened the phencyclidine ( PCP ) - induced prolonged swimming latency in rats in a water maze task .
### Output Text:
<span class="chemical">NRA0160</span> and <span class="chemical">clozapine</span> significantly shortened the <span class="chemical">phencyclidine</span> ( <span class="chemical">PCP</span> ) - induced prolonged swimming latency in rats in a water maze task . 