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: An unexpected diagnosis in a renal - transplant patient with proteinuria treated with everolimus : AL amyloidosis .
### Output Text:
An unexpected diagnosis in a renal - transplant patient with proteinuria treated with <span class="chemical">everolimus</span> : AL amyloidosis . 