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: METHODS : In this study 26 patients with various hematological disorders were randomized to receive either intravenous AmB alone or AmB and oral spironolactone 100 mg twice daily when developing a proven or suspected fungal infection .
### Output Text:
METHODS : In this study 26 patients with various hematological disorders were randomized to receive either intravenous <span class="chemical">AmB</span> alone or <span class="chemical">AmB</span> and oral <span class="chemical">spironolactone</span> 100 mg twice daily when developing a proven or suspected fungal infection . 