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 has been suggested that adenylate cyclase inhibition may be important in the development of both nephrogenic diabetes insipidus and hypothyroidism during lithium treatment .
### Output Text:
It has been suggested that adenylate cyclase inhibition may be important in the development of both nephrogenic diabetes insipidus and hypothyroidism during <span class="chemical">lithium</span> treatment . 