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: Two others had a mixed ( cholestatic and cytolytic ) hepatitis following carbimazole .
### Output Text:
Two others had a mixed ( cholestatic and cytolytic ) hepatitis following <span class="chemical">carbimazole</span> . 