preferred_name: butanoate(in) + Na(+)(in) => butanoate(out) + Na(+)(out)
preferred_name_lc: butanoate(in) + na(+)(in) => butanoate(out) + na(+)(out)
label: butanoate(in) + Na(+)(in) => butanoate(out) + Na(+)(out)
label_lc: butanoate(in) + na(+)(in) => butanoate(out) + na(+)(out)