21185
The models obtained were able to rationally describe the affinity trends resulting from biological testing , and to enable investigation of the role of different substituents on the 8 - azapurine scaffold , as well as the influence of the newly introduced fluorine atom on the benzyl moiety .
 Chemical: 8 - azapurine; Chemical: fluorine; Chemical: benzyl
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: 8 - azapurine; Chemical: fluorine; Chemical: benzyl