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: These findings suggest that NIK - 247 at a low dose ( 0 . 1 - 1 mg / kg p . o . ) improves scopolamine - induced amnesia but does not affect spontaneous movement .
### Output Text:
These findings suggest that <span class="chemical">NIK - 247</span> at a low dose ( 0 . 1 - 1 mg / kg p . o . ) improves <span class="chemical">scopolamine</span> - induced amnesia but does not affect spontaneous movement . 