9107
In this work , a facile photoinduced one - step method was first developed for the covalent immobilization of ATRP initiators on the C - H group - containing substrates such as biaxially oriented polypropylene ( BOPP ) .
 Chemical: C - H; Chemical: polypropylene
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: C - H; Chemical: polypropylene