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