[Structural formula]:



　name :Tadalafil,Cialis

　Chemical name:(6R,12aR)-6-Benzofuran-5-yl-2-methyl-2,3,6,7,12, 12a-hexahydropyrazino-[1',2'-1,6]-pyrido[3,4-b]indole-1,4-dione

　CAS 号：171596-29-5

　Molecular formula :C₂₂H₁₉N₃O₄

　Appearance:White crystal powlder

　Melting point :300-303℃

　Drying loss : ≤0.5%

　Heavry metal : ≤50ppm

　Assay:≥99.5%

　Specific rotation :[a] 20 D=+70-72o ( C=1.00 , CHCl₃ )

　TLC:only one facula

　Main use :Second-generation type- 5 phosphodiesterase inhibitor ,
　it is used to cure men's erection