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: Reye syndrome may be disappearing from Australia despite a total lack of association with salicylates or aspirin ingestion , since there were no cases found at The Children ' s Hospital in 1983 , 1984 , or 1985 .
### Output Text:
Reye syndrome may be disappearing from Australia despite a total lack of association with <span class="chemical">salicylates</span> or <span class="chemical">aspirin</span> ingestion , since there were no cases found at The Children ' s Hospital in 1983 , 1984 , or 1985 . 