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 Science Journal, Iraq, Baghdad, v. 17, n. 4, p. 1190, 2020. DOI: 10.21123/bsj.2020.17.4.1190. Disponível em: https://bsj.uobaghdad.edu.iq/index.php/BSJ/article/view/4270.. Acesso em: 27 jan. 2025.