Separation and structural elucidation of a novel vardenafil analogue as an adulterant in a natural health care dietary supplement by Chunzheng Li, Xinzheng Wang, Shengming Wu, Junqing Zhao, Junjian Fang, Hui Li, Yingjie Zhu, Kang Zhang, Jing Peng, Jie Mao, Weihua Li, Kun He, Na Wang, Fangting Dong

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