4-(beta-D-ribofuranosyl)aminobenzene 5'-phosphate + CO2 + diphosphate => 4-aminobenzoate + 5-phospho-alpha-D-ribose 1-diphosphate + H(+)
4-(beta-d-ribofuranosyl)aminobenzene 5'-phosphate + co2 + diphosphate => 4-aminobenzoate + 5-phospho-alpha-d-ribose 1-diphosphate + h(+)