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: Captopril may , by the same mechanism , reduce the increase in glomerular filtration that is known to occur after an injection of thrombin , thereby diminishing the aggregation of fibrin monomers in the glomeruli , with the result that less fibrin will be deposited and thus less kidney damage will be produced .
### Output Text:
<span class="chemical">Captopril</span> may , by the same mechanism , reduce the increase in glomerular filtration that is known to occur after an injection of thrombin , thereby diminishing the aggregation of fibrin monomers in the glomeruli , with the result that less fibrin will be deposited and thus less kidney damage will be produced . 