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The empirical formula for tadalafil is C22H19N3O4, and its official organic name is (6R,12aR)-6-(1,3-benzodioxol-5-yl)-2,3,6,7,12,12a- hexahydro-2-methyl-pyrazino[1 ,2 :1,6]pyrido[3,4-b]indole-1,4-dione. The molecular weight is 389.41. Tadalafil tablets marketed under the brand name ‘Cialis’ are yellow, film-coated, and almond-shaped; produced in 5, 10, or 20 mg doses.

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