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: We report a case of hypotension , bradycardia , and asystole after intravenous administration of high - dose methylprednisolone in a 73 - year - old patient who underwent electrocardiographic ( ECG ) monitoring throughout the episode .
### Output Text:
We report a case of hypotension , bradycardia , and asystole after intravenous administration of high - dose <span class="chemical">methylprednisolone</span> in a 73 - year - old patient who underwent electrocardiographic ( ECG ) monitoring throughout the episode . 