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 present study was carried out to test the effects of L - alpha - glycerylphosphorylcholine ( L - alpha - GFC ) on memory impairment induced by scopolamine in man .
### Output Text:
The present study was carried out to test the effects of <span class="chemical">L - alpha - glycerylphosphorylcholine</span> ( <span class="chemical">L - alpha - GFC</span> ) on memory impairment induced by <span class="chemical">scopolamine</span> in man . 