diaminohydroxyphosphoribosylaminopyrimidine deaminase activity obsolete 2,5-diamino-6-ribitylamino-4(3H)-pyrimidinone 5'-phosphate deaminase activity https://github.com/geneontology/go-ontology/issues/25262 https://github.com/geneontology/go-ontology/issues/28173 true 2,5-diamino-6-(5-phosphoribitylamino)pyrimidin-4(3H)-one deaminase activity OBSOLETE. Catalysis of the reaction: 2,5-diamino-6-(5-phospho-D-ribitylamino)pyrimidin-4(3H)-one + H2O = 5-amino-6-(5-phospho-D-ribosylamino)uracil + ammonia. The reason for obsoletion is that this term represents the same function as diaminohydroxyphosphoribosylaminopyrimidine deaminase activity. DRAP deaminase activity GO:0017173 GO:0043723 molecular_function