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: Bradykinin receptors antagonists and nitric oxide synthase inhibitors in vincristine and streptozotocin induced hyperalgesia in chemotherapy and diabetic neuropathy rat model .
### Output Text:
<span class="chemical">Bradykinin</span> receptors antagonists and <span class="chemical">nitric oxide</span> synthase inhibitors in <span class="chemical">vincristine</span> and <span class="chemical">streptozotocin</span> induced hyperalgesia in chemotherapy and diabetic neuropathy rat model . 