10073
Structural analysis revealed that the appropriately substituted pyrrolo [ 2 , 3 - b ] pyridine induced a rare helical DFG - loop conformation .
 Chemical: pyrrolo [ 2 , 3 - b ] pyridine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: pyrrolo [ 2 , 3 - b ] pyridine