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: The patient cohort ( 14 men , 11 women ) was treated with SRL as conversion therapy , due to chronic allograft nephropathy ( CAN ) ( n = 15 ) neoplasia ( n = 8 ) ; Kaposi ' s sarcoma , Four skin cancers , One intestinal tumors , One renal cell carsinom ) or BK virus nephropathy ( n = 2 ) .
### Output Text:
The patient cohort ( 14 men , 11 women ) was treated with <span class="chemical">SRL</span> as conversion therapy , due to chronic allograft nephropathy ( CAN ) ( n = 15 ) neoplasia ( n = 8 ) ; Kaposi ' s sarcoma , Four skin cancers , One intestinal tumors , One renal cell carsinom ) or BK virus nephropathy ( n = 2 ) . 