preferred_name: androst-5-ene-3,17-dione <=> androst-4-ene-3,17-dione
preferred_name_lc: androst-5-ene-3,17-dione <=> androst-4-ene-3,17-dione
label: androst-5-ene-3,17-dione <=> androst-4-ene-3,17-dione
label_lc: androst-5-ene-3,17-dione <=> androst-4-ene-3,17-dione