Dapoxetine Impurity 4 Catalogue D216344 CAS 147199-39-1 M.W 291.39 M.F C20H21NO Specifications FAQs Dapoxetine (S)-Isomer N-Demethyl ; (S)-N-Methyl-3-(naphthalen-1-yloxy)-1-phenylpropan-1-amine