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: These 13 included cases of malignant hypertension , thrombotic microangiopathy , lupus nephritis , Henoch - Schonlein nephritis , crescentic glomerulonephritis , and cocaine - related acute renal failure .
### Output Text:
These 13 included cases of malignant hypertension , thrombotic microangiopathy , lupus nephritis , Henoch - Schonlein nephritis , crescentic glomerulonephritis , and <span class="chemical">cocaine</span> - related acute renal failure . 