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: CONCLUSION : A 63 - year - old man with renal amyloidosis and SVC syndrome secondary to HITT was successfully treated with argatroban and CDT with alteplase .
### Output Text:
CONCLUSION : A 63 - year - old man with renal amyloidosis and SVC syndrome secondary to HITT was successfully treated with <span class="chemical">argatroban</span> and CDT with alteplase . 