androsta-1,4-diene-3,17-dione + AH2 => 5alpha-androst-1-ene-3,17-dione + A
androsta-1,4-diene-3,17-dione + ah2 => 5alpha-androst-1-ene-3,17-dione + a
androsta-1,4-diene-3,17-dione + AH2 => 5alpha-androst-1-ene-3,17-dione + A
androsta-1,4-diene-3,17-dione + ah2 => 5alpha-androst-1-ene-3,17-dione + a