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: In addition , the lung tissue had unevenly distributed hemosiderin deposition , and abnormally tortuous capillaries were seen in the mass and in heavily hemosiderotic lung portions outside the mass .
### Output Text:
In addition , the lung tissue had unevenly distributed hemosiderin deposition , and abnormally tortuous capillaries were seen in the mass and in heavily hemosiderotic lung portions outside the mass . 