Aminotadalafil385769-84-6100 % similar Tadalafil171596-29-579 % similar Nortadalafil171596-36-469 % similar Chloropretadalafil171489-59-164 % similar Methyl (1R,3R)-1-(1,3-benzodioxol-5-yl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-B]indole-3-carboxylate171596-41-147 % similar Methyl (1R,3R)-1-(benzo[d][1,3]dioxol-5-yl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole-3-carboxylate hydrochloride171752-68-445 % similar 3′,4′-Methylenedioxymandelic acid27738-46-132 % similar