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: We suggest that our patient ' s tubular dysfunction and myopathy may have resulted from mitochondrial dysfunction which is triggered by tacrolimus and augmented by lamivudine .
### Output Text:
We suggest that our patient ' s tubular dysfunction and myopathy may have resulted from mitochondrial dysfunction which is triggered by <span class="chemical">tacrolimus</span> and augmented by <span class="chemical">lamivudine</span> . 