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Use of liquid chromatography–mass spectrometry and a chemical cleavage reaction for the structure elucidation of a new sildenafil analogue detected as an adulterant in an herbal dietary supplement[J] . John C. Reepmeyer,Jeffrey T. Woodruff.Journal of Pharmaceutical and Biomedical Analysis . 2007 (4)
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Analysis of undeclared synthetic phosphodiesterase-5 inhibitors in dietary supplements and herbal matrices by LC–ESI–MS and LC–UV[J] . Samuel R. Gratz,Cheryl L. Flurer,Karen A. Wolnik.Journal of Pharmaceutical and Biomedical Analysis . 2004 (3)