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: After 1 week of recovery , proteinuria was induced by adriamycin [ 1 . 5 mg / kg intravenously ( i . v . ) n = 18 ; controls , saline i . v . n = 9 ] .
### Output Text:
After 1 week of recovery , proteinuria was induced by <span class="chemical">adriamycin</span> [ 1 . 5 mg / kg intravenously ( i . v . ) n = 18 ; controls , saline i . v . n = 9 ] . 