. . . "Nicotinic acid phosphoribosyltransferase" . "Nicotinate phosphoribosyltransferase" . "Nicotinic acid mononucleotide glycohydrolase" . "Nicotinic acid mononucleotide pyrophosphorylase" . "Niacin ribonucleotidase" . "Beta-nicotinate D-ribonucleotide + diphosphate = nicotinate + 5-phospho-alpha-D-ribose 1-diphosphate." .