diaminohydroxyphosphoribosylaminopyrimidine deaminase activity https://github.com/geneontology/go-ontology/issues/25262 https://github.com/geneontology/go-ontology/issues/28526 2,5-diamino-6-hydroxy-4-(5-phosphoribosylamino)-pyrimidine 2-aminohydrolase activity MetaCyc:RXN-10058 Catalysis of the reaction: 2,5-diamino-6-hydroxy-4-(5-phosphoribosylamino)-pyrimidine + H2O + H+ = 5-amino-6-(5-phosphoribosylamino)uracil + NH4. EC:3.5.4.26 GO:0008835 2,5-diamino-6-(ribosylamino)-4(3H)-pyrimidinone 5'-phosphate deaminase activity KEGG_REACTION:R03459 RHEA:21868 2,5-diamino-6-hydroxy-4-(5-phosphoribosylamino)pyrimidine 2-aminohydrolase activity molecular_function MetaCyc:RIBOFLAVINSYNDEAM-RXN GO:0008485 hydrolase activity, acting on carbon-nitrogen (but not peptide) bonds, in cyclic amidines deaminase activity