Vardenafil Impurity 2

Chemical Name: Imidazo[5,​1-​f]​[1,​2,​4]​triazine-​7-​carboxylic acid, 2-​[2-​ethoxy-​5-​[(4-​ethyl-​1-​piperazinyl)​sulfonyl]​phenyl]​-​1,​4-​dihydro-​5-​methyl-​4-​oxo-​, ethyl ester;