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