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: Administration of green tea ( 100 mg / kg / day , p . o . ) and vitamin E ( 100 mg / kg / day , p . o . ) together for 30 consecutive days and challenged with ISO on the day 29th and 30th , showed a significant ( P < 0 . 05 ) decrease in heart weight , serum marker enzymes , lipid peroxidation , Ca + 2 ATPase and a significant increase in the body weight , endogenous antioxidants , Na + / K + ATPase and Mg + 2 ATPase when compared with ISO treated group and green tea or vitamin E alone treated groups .
### Output Text:
Administration of <span class="chemical">green tea</span> ( 100 mg / kg / day , p . o . ) and <span class="chemical">vitamin E</span> ( 100 mg / kg / day , p . o . ) together for 30 consecutive days and challenged with <span class="chemical">ISO</span> on the day 29th and 30th , showed a significant ( P < 0 . 05 ) decrease in heart weight , serum marker enzymes , lipid peroxidation , <span class="chemical">Ca</span> + 2 ATPase and a significant increase in the body weight , endogenous antioxidants , <span class="chemical">Na</span> + / <span class="chemical">K</span> + ATPase and <span class="chemical">Mg</span> + 2 ATPase when compared with <span class="chemical">ISO</span> treated group and <span class="chemical">green tea</span> or <span class="chemical">vitamin E</span> alone treated groups . 