preferred_name: a 3-oxo-5alpha-steroid + A <=> a 3-oxo-Delta(4)-steroid + AH2
preferred_name_lc: a 3-oxo-5alpha-steroid + a <=> a 3-oxo-delta(4)-steroid + ah2
label: a 3-oxo-5alpha-steroid + A <=> a 3-oxo-Delta(4)-steroid + AH2
label_lc: a 3-oxo-5alpha-steroid + a <=> a 3-oxo-delta(4)-steroid + ah2