5alpha-androstan-3,17-dione + A = androst-4-ene-3,17-dione + AH2
5alpha-androstan-3,17-dione + a = androst-4-ene-3,17-dione + ah2
5alpha-androstan-3,17-dione + A = androst-4-ene-3,17-dione + AH2
5alpha-androstan-3,17-dione + a = androst-4-ene-3,17-dione + ah2