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