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: RESULTS : The results of this paper confirm that inhibition of bradykinin receptors and inducible NO synthase but not neuronal NO synthase activity reduces diabetic hyperalgesia .
### Output Text:
RESULTS : The results of this paper confirm that inhibition of <span class="chemical">bradykinin</span> receptors and inducible <span class="chemical">NO</span> synthase but not neuronal <span class="chemical">NO</span> synthase activity reduces diabetic hyperalgesia . 