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: Neuroleptic malignant syndrome induced by combination therapy with tetrabenazine and tiapride in a Japanese patient with Huntington ' s disease at the terminal stage of recurrent breast cancer .
### Output Text:
Neuroleptic malignant syndrome induced by combination therapy with <span class="chemical">tetrabenazine</span> and <span class="chemical">tiapride</span> in a Japanese patient with Huntington ' s disease at the terminal stage of recurrent breast cancer . 