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