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 chronic feeding of small amounts ( 0 . 3 - 3 % of diet weight ) of certain amino derivatives of caproate resulted in hyperglycemia , an elevated glucose tolerance curve and , occasionally , glucosuria .
### Output Text:
The chronic feeding of small amounts ( 0 . 3 - 3 % of diet weight ) of certain <span class="chemical">amino</span> derivatives of <span class="chemical">caproate</span> resulted in hyperglycemia , an elevated <span class="chemical">glucose</span> tolerance curve and , occasionally , glucosuria . 