preferred_name: 2 phosphate + 2 H(+)(out) => diphosphate + H2O + H(+)(in)
preferred_name_lc: 2 phosphate + 2 h(+)(out) => diphosphate + h2o + h(+)(in)
label: 2 phosphate + 2 H(+)(out) => diphosphate + H2O + H(+)(in)
label_lc: 2 phosphate + 2 h(+)(out) => diphosphate + h2o + h(+)(in)