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NAMECIALIS® (tadalafil).Chemical y, tadalafil is pyrazino[1', 2':1, 6]pyrido[3, 4-b]indole-1, 4-dione, 6-(1, 3-benzodioxol-5-yl)-2, 3, 6, 7, 12, 12a-hexahydro-2-methyl-, (6R, 12aR)-. Tadalafil has the empirical formula C22H19N3O4 representing a molecular weight of 389.41. Tadalafil is a crystal ine solid that is practical y insoluble in water and very slightly soluble in ethanol. The CAS number for tadalafil is 171596-29-5.Tadalafil has the fol owing structural formula: