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: One case of acute hypercalcaemia and two of recurrent nephrolithiasis are reported in patients who had regularly consumed large amounts of calcium carbon - ate - sodium bicarbonate powders for more than 20 years .
### Output Text:
One case of acute hypercalcaemia and two of recurrent nephrolithiasis are reported in patients who had regularly consumed large amounts of <span class="chemical">calcium carbon - ate</span> - <span class="chemical">sodium bicarbonate</span> powders for more than 20 years . 