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