preferred_name: (S)-demethyl-4-deoxygadusol => (R)-demethyl-4-deoxygadusol
preferred_name_lc: (s)-demethyl-4-deoxygadusol => (r)-demethyl-4-deoxygadusol
label: (S)-demethyl-4-deoxygadusol => (R)-demethyl-4-deoxygadusol
label_lc: (s)-demethyl-4-deoxygadusol => (r)-demethyl-4-deoxygadusol