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: In patients with decompensated heart failure with hypotension after treatment with milrinone , low doses of vasopressin restored blood pressure without inhibiting the inotropic effect of milrinone .
### Output Text:
In patients with decompensated heart failure with hypotension after treatment with <span class="chemical">milrinone</span> , low doses of <span class="chemical">vasopressin</span> restored blood pressure without inhibiting the inotropic effect of <span class="chemical">milrinone</span> . 