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