9009
( 4 , 4 ' ) - Bipyridine in vacuo and in solvents : a quantum chemical study of a prototypical floppy molecule from a molecular transport perspective .
 Chemical: ( 4 , 4 ' ) - Bipyridine
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: ( 4 , 4 ' ) - Bipyridine