androst-5-ene-3,17-dione = androst-4-ene-3,17-dione
androst-5-ene-3,17-dione = androst-4-ene-3,17-dione
androst-5-ene-3,17-dione = androst-4-ene-3,17-dione
androst-5-ene-3,17-dione = androst-4-ene-3,17-dione