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: The angioedema resolved after therapy with intravenous steroids and diphenhydramine hydrochloride .
### Output Text:
The angioedema resolved after therapy with intravenous <span class="chemical">steroids</span> and <span class="chemical">diphenhydramine</span> hydrochloride . 