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: The present study was aimed to investigate the combined effects of green tea and vitamin E on heart weight , body weight , serum marker enzymes , lipid peroxidation , endogenous antioxidants and membrane bound ATPases in isoproterenol ( ISO ) - induced myocardial infarction in rats .
### Output Text:
The present study was aimed to investigate the combined effects of <span class="chemical">green tea</span> and <span class="chemical">vitamin E</span> on heart weight , body weight , serum marker enzymes , lipid peroxidation , endogenous antioxidants and membrane bound ATPases in <span class="chemical">isoproterenol</span> ( <span class="chemical">ISO</span> ) - induced myocardial infarction in rats . 