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