5alpha-androstan-3,17-dione + A <=> 5alpha-androst-1-ene-3,17-dione + AH2
5alpha-androstan-3,17-dione + a <=> 5alpha-androst-1-ene-3,17-dione + ah2
5alpha-androstan-3,17-dione + A <=> 5alpha-androst-1-ene-3,17-dione + AH2
5alpha-androstan-3,17-dione + a <=> 5alpha-androst-1-ene-3,17-dione + ah2