. "Catalysis of the reaction: H(2)O + nicotinamide mononucleotide = D-ribose 5-phosphate + H(+) + nicotinamide." . . "NMN nucleosidase activity" . "nicotinamide mononucleotidase activity" . "nicotinamide mononucleotide nucleosidase activity" . "nicotinamide-nucleotide phosphoribohydrolase activity" . "NMN glycohydrolase activity" . "NMNase activity" . "NMNGhase activity" . .