A novel vardenafil analog in a healthcare product: Preparation, characterization, and quantification by Jintao Xia, Wanqin Wu, Feng Jiang, Songsong Zhu

“…This compound was subsequently isolated by silica gel column chromatography and characterized by 1D (dimension) and 2D nuclear magnet resonance (NMR) specta, ultra-violet (UV) spectra, and fourier transform infrared (IR) spectra. …”
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