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