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: Other adverse reactions significantly linked with active drugs include impaired glucose tolerance in men and women and gout in men , associated with bendrofluazide treatment , and Raynaud ' s phenomenon and dyspnoea in men and women taking propranolol .
### Output Text:
Other adverse reactions significantly linked with active drugs include impaired glucose tolerance in men and women and gout in men , associated with <span class="chemical">bendrofluazide</span> treatment , and Raynaud ' s phenomenon and dyspnoea in men and women taking <span class="chemical">propranolol</span> . 