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: Reported herein is an autopsy case of valvular heart disease , in a patient who developed a lung mass ( 1 . 5 cm in diameter ) and proteinuria ( 2 . 76 g / day ) after treatment with amiodarone for a long time .
### Output Text:
Reported herein is an autopsy case of valvular heart disease , in a patient who developed a lung mass ( 1 . 5 cm in diameter ) and proteinuria ( 2 . 76 g / day ) after treatment with <span class="chemical">amiodarone</span> for a long time . 