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