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