(6R,12aR)-2-methyl-6-(2-oxobenzo[d][1,3]dioxol-5-yl)-2,3,12,12a-tetrahydropyrazino[1',2':1,6]pyrido[3,4-b]indole-1,4(6H,7H)-dione; (6R,12aR)-6-(2-Oxo-1,3-benzodioxol-5-yl)-2,3,6,7,12,12a-hexahydro-2-methylpyrazino[1',2':1,6]pyrido[3,4-b]indole-1,4-dione; 2’-Keto Tadalafil;
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