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: Previous studies evaluated the tolerance of nimesulide and paracetamol in subjects with cutaneous , respiratory and anaphylactoid reactions induced by nonsteroidal anti - inflammatory drugs ( NSAIDs ) .
### Output Text:
Previous studies evaluated the tolerance of <span class="chemical">nimesulide</span> and <span class="chemical">paracetamol</span> in subjects with cutaneous , respiratory and anaphylactoid reactions induced by <span class="chemical">nonsteroidal anti - inflammatory drugs</span> ( <span class="chemical">NSAIDs</span> ) . 