Nortadalafil171596-36-4100 % similar Tadalafil171596-29-569 % similar Aminotadalafil385769-84-669 % similar Chloropretadalafil171489-59-167 % similar Methyl (1R,3R)-1-(1,3-benzodioxol-5-yl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-B]indole-3-carboxylate171596-41-151 % 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 hydrochloride171752-68-449 % similar 3′,4′-Methylenedioxymandelic acid27738-46-133 % similar 1-Methyl-1,2,3,4-tetrahydro-β-carboline-3-carboxylic acid5470-37-133 % similar Boc-D-1,2,3,4-tetrahydronorharman-3-carboxylic acid123910-26-931 % similar