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Chemical Name: Tadalafil EP Impurity B
Synonym: (6S,12aS)-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; L-Tadalafil; L-Tildenafil; ent-Tadalafil