12567
A new class of sila - substituted 1 , 3 , 4 - oxadiazoles was synthesized by a convenient synthetic method .
 Chemical: sila - substituted 1 , 3 , 4 - oxadiazoles
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: sila - substituted 1 , 3 , 4 - oxadiazoles