15044
This result , as well as computational studies , suggests that sila - substitution ( C / Si exchange ) is useful for structure optimization of these inhibitors .
 Chemical: C; Chemical: Si
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; Chemical: Si