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