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: It is concluded that acute amiloride administration to lithium - treated patients suffering from polydipsia and polyuria might relieve these patients but prolonged amiloride supplementation would result in elevated lithium levels and might be hazardous .
### Output Text:
It is concluded that acute <span class="chemical">amiloride</span> administration to <span class="chemical">lithium</span> - treated patients suffering from polydipsia and polyuria might relieve these patients but prolonged <span class="chemical">amiloride</span> supplementation would result in elevated <span class="chemical">lithium</span> levels and might be hazardous . 