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