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: A new infarct - avid radiopharmaceutical based on glucaric acid was prepared in the hospital radiopharmacy of the INCMNSZ .
### Output Text:
A new infarct - avid radiopharmaceutical based on <span class="chemical">glucaric acid</span> was prepared in the hospital radiopharmacy of the INCMNSZ . 