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: Amiodarone - related pulmonary mass and unique membranous glomerulonephritis in a patient with valvular heart disease : Diagnostic pitfall and new findings .
### Output Text:
<span class="chemical">Amiodarone</span> - related pulmonary mass and unique membranous glomerulonephritis in a patient with valvular heart disease : Diagnostic pitfall and new findings . 