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A self - assembled nanogel , derived from an acid - labile cholesteryl - modified pullulan ( acL - CHP ) , was prepared by grafting vinyl ether - cholesterol substituents onto a 100 kD pullulan main chain polymer backbone .
 Chemical: cholesteryl; Chemical: vinyl ether; Chemical: cholesterol
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: cholesteryl; Chemical: vinyl ether; Chemical: cholesterol