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: Long - term efficacy and adverse event of nifedipine sustained - release tablets for cyclosporin A - induced hypertension in patients with psoriasis .
### Output Text:
Long - term efficacy and adverse event of <span class="chemical">nifedipine</span> sustained - release tablets for <span class="chemical">cyclosporin A</span> - induced hypertension in patients with psoriasis . 