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 study reviews the current proposed mechanisms of sudden death after a high dose of intravenous methylprednisolone ( IVMP ) .
### Output Text:
This study reviews the current proposed mechanisms of sudden death after a high dose of intravenous <span class="chemical">methylprednisolone</span> ( <span class="chemical">IVMP</span> ) . 