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: This is a case report on a 45 - year old African - American female with newly diagnosed hypertension , who was started on a combination pill of amlodipine / benazapril 10 / 5 mg .
### Output Text:
This is a case report on a 45 - year old African - American female with newly diagnosed hypertension , who was started on a combination pill of <span class="chemical">amlodipine</span> / <span class="chemical">benazapril</span> 10 / 5 mg . 