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