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: A case of veno - occlusive disease of the liver with fatal outcome after dacarbazine ( DTIC ) therapy for melanoma is reported .
### Output Text:
A case of veno - occlusive disease of the liver with fatal outcome after <span class="chemical">dacarbazine</span> ( <span class="chemical">DTIC</span> ) therapy for melanoma is reported . 