Separation and structural elucidation of a novel analogue of vardenafil included as an adulterant in a dietary supplement by liquid chromatography–electrospray ionization mass spectrometry, infrared spectroscopy and nuclear magnetic resonance spectroscopy

2011 ◽  
Vol 54 (3) ◽  
pp. 491-496 ◽  
Author(s):  
Hwa-Mi Lee ◽  
Chang Soo Kim ◽  
Young Mi Jang ◽  
Sung Won Kwon ◽  
Bong-Jin Lee
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