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