Acetildenafil: Acetildenafil (a.k.a. Hongdenafil) is an unapproved research chemical often detected as an undeclared adulterant in "herbal" sexual-enhancement supplements. Pharmacologically it shows sub-micromolar PDE-5 inhibition comparable to sildenafil (IC50 ≈ 7.6 nM), with a slightly longer half
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