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: Compared with the young group , the elderly group had greater scopolamine - induced impairment in word recall 60 , 90 and 120 minutes after administration ( p < 0 . 05 ) .
### Output Text:
Compared with the young group , the elderly group had greater <span class="chemical">scopolamine</span> - induced impairment in word recall 60 , 90 and 120 minutes after administration ( p < 0 . 05 ) . 