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: 99mTc - glucarate was easy to prepare , stable for 96 h and was used to study its biodistribution in rats with isoproterenol - induced acute myocardial infarction .
### Output Text:
<span class="chemical">99mTc - glucarate</span> was easy to prepare , stable for 96 h and was used to study its biodistribution in rats with <span class="chemical">isoproterenol</span> - induced acute myocardial infarction . 