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Determination of Phosphodiesterase Type 5 Enzyme (PDE-5) Inhibitors and Analogues As Adulterants in Selected Herbal Products Using Gas Chromatography–Electron Impact-Mass Spectrometer (GC-EI-MS). Baghdad Sci.J 2020, 17 (4), 1190. https://doi.org/10.21123/bsj.2020.17.4.1190.