Dutasteride Imp.B (Pharmaeuropa): (4aR,4bS,6aS,7S,9aS,9bS,11aR)-N,N,4a,6a-tetramethyl-2-oxo-2,4a,4b,5,6,6a,7,8,9,9a,9b,(Dutasteride Dimethlamide).