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: Recurrence of hepatitis attack might have been avoided if the initial incident had been communicated to the attending physician who prescribed telithromycin the second time .
### Output Text:
Recurrence of hepatitis attack might have been avoided if the initial incident had been communicated to the attending physician who prescribed <span class="chemical">telithromycin</span> the second time . 