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