preferred_name: maleate(in) + sulfate(out) => maleate(out) + sulfate(in)
preferred_name_lc: maleate(in) + sulfate(out) => maleate(out) + sulfate(in)
label: maleate(in) + sulfate(out) => maleate(out) + sulfate(in)
label_lc: maleate(in) + sulfate(out) => maleate(out) + sulfate(in)