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D-Tryptophan methyl ester hydrochloride，CAS:14907-27-8

Chemical Name：D-Tryptophan methyl ester hydrochloride MF：C12H15ClN2O2 Purpose：Tadalafil intermediate 1

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Tadalafil impurity 3CAS:171596-43-3

Chemical Name：(1S,3S)-1-(1,3-Benzodioxol-5-yl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole-3-carboxylic Acid Methyl ester MF：C20H18N2O4 Purpose：Tadalafil intermediate impurity 3

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Tadalafil intermediate 2, CAS:171752-68-4

Chemical Name：(1R,3R)-Methyl 1-(benzo[d][1,3]dioxol-5-yl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole-3-carboxylate hydrochloride MF：C20H18N2O4.ClH Purpose：Tadalafil intermediate 2

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Tadalafil intermediate 2（Non hydrochloride），CAS:171596-41-1

Chemical Name：(1R,3R)-Methyl-1,2,3,4-Tetrahydro-1-(3,4-Methylenedioxyphenyl)-9H-Pyrido[3,4-b]Indole-3-Carboxylate MF：C20H18N2O4 Purpose：Tadalafil intermediate 2（Non hydrochloride）

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Tadalafil intermediate 3，CAS:171489-59-1

Chemical Name：(1R,3R)-1-(1,3-Benzodioxol-5-yl)-2-(chloroacetyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole-3-carboxylicacidmethyeste MF：C22H19ClN2O5 Purpose：Tadalafil intermediate 3

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