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: He was treated with lidocaine 50 mg intravenously followed by infusion 1500 mg in dextrose 5 % / 24 hour and potassium aspartate tablet .
### Output Text:
He was treated with <span class="chemical">lidocaine</span> 50 mg intravenously followed by infusion 1500 mg in <span class="chemical">dextrose</span> 5 % / 24 hour and <span class="chemical">potassium aspartate</span> tablet . 