(4bS,6aS,7S,9aS,9bS)-N-[2,5-Bis(trifluoromethyl)phenyl]-2,4b,5,6,6a,7,8,9,9a,9b,10,11-dodecahydro-6a-methyl-2-oxo-1H-indeno[5,4-f]quinoline-7-carboxamide, is an impurity of Dutasteride (D735000), used in the treatment of benign prostatic hyperplasia.