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Dutasteride(DUT),selective inhibitor of both type 1 and type 2 isoforms of 5α-reductase enzyme that converts testosterone to 5α dihydro testosterone which is responsible for enlargement of prostate,chemically it shown as(5α,17β)-N-{2,5 bis(trifluoromethyl)phenyl}-3-oxo-4-azaandrost-1ene-17-carboxamide.