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 NMS - like encephalopathy that develops in association with the use of antidepressants indicates that NMS and SS are spectrum disorders induced by drugs with both antidopaminergic and serotonergic effects .
### Output Text:
The NMS - like encephalopathy that develops in association with the use of antidepressants indicates that NMS and SS are spectrum disorders induced by drugs with both antidopaminergic and serotonergic effects . 