preferred_name: histamine(out) + 2 H(+)(in) => histamine(in) + 2 H(+)(out)
preferred_name_lc: histamine(out) + 2 h(+)(in) => histamine(in) + 2 h(+)(out)
label: histamine(out) + 2 H(+)(in) => histamine(in) + 2 H(+)(out)
label_lc: histamine(out) + 2 h(+)(in) => histamine(in) + 2 h(+)(out)