preferred_name: spermidine(out) + n H(+)(in) => spermidine(in) + n H(+)(out)
preferred_name_lc: spermidine(out) + n h(+)(in) => spermidine(in) + n h(+)(out)
label: spermidine(out) + n H(+)(in) => spermidine(in) + n H(+)(out)
label_lc: spermidine(out) + n h(+)(in) => spermidine(in) + n h(+)(out)