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