preferred_name: 4-hydroxybenzoate(out) + H(+)(in) => 4-hydroxybenzoate(in) + H(+)(out)
preferred_name_lc: 4-hydroxybenzoate(out) + h(+)(in) => 4-hydroxybenzoate(in) + h(+)(out)
label: 4-hydroxybenzoate(out) + H(+)(in) => 4-hydroxybenzoate(in) + H(+)(out)
label_lc: 4-hydroxybenzoate(out) + h(+)(in) => 4-hydroxybenzoate(in) + h(+)(out)