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: Hippocampal deficits were mapped and correlated with memory performance on a word - recall test ( p < 0 . 05 ) .
### Output Text:
Hippocampal deficits were mapped and correlated with memory performance on a word - recall test ( p < 0 . 05 ) . 