22371
In the present study , a reactive oxygen species - responsive nanocarrier has been successfully self - assembled from an amphiphilic hyperbranched polymer consisting of alternative hydrophobic selenide groups and hydrophilic phosphate segments in the dendritic backbone .
 Chemical: oxygen; Chemical: selenide; Chemical: phosphate
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: oxygen; Chemical: selenide; Chemical: phosphate