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