Anastrozole EP impurity B

Chemical Name: (2RS)-2,3-bis[3-(1-cyano-1-methylethyl)-5-(1H-1,2,4-triazol-1-ylmethyl)phenyl]-2-methylpropanenitrile (as per EP) ; 2,3-Bis(3-(1-cyano-1-methylethyl)-5-(1H-1,2,4-triazol-1-ylmethyl)phenyl)-2-methylpropionitrile (as per USP)

Smile: CC(CC1=CC(CN2N=CN=C2)=CC(C(C)(C)C#N)=C1)(C3=CC(CN4N=CN=C4)=CC(C(C)(C)C#N)=C3)C#N