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: Attention to the possible induction of specific tardive dyskinesia is called for in the use of this drug .
### Output Text:
Attention to the possible induction of specific tardive dyskinesia is called for in the use of this drug . 