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: The TDP resolved when fluconazole was discontinued ; however , the patient continued to have premature ventricular contractions and nonsustained ventricular tachycardia ( NSVT ) until six days after drug cessation DISCUSSION : Use of the Naranjo probability scale indicates a probable relationship between the use of fluconazole and the development of TDP .
### Output Text:
The TDP resolved when <span class="chemical">fluconazole</span> was discontinued ; however , the patient continued to have premature ventricular contractions and nonsustained ventricular tachycardia ( NSVT ) until six days after drug cessation DISCUSSION : Use of the Naranjo probability scale indicates a probable relationship between the use of <span class="chemical">fluconazole</span> and the development of TDP . 