obsolete [1-(2-amino-7-methyl-4-oxo-7,8-dihydro-3H-pteridin-6-yl)]ethyl-4-(beta-D-ribofuranosyl)aminobenzene 5'-phosphate synthase activity (obsolete GO:0102638)
OBSOLETE. Catalysis of the reaction: 4-(beta-D-ribofuranosyl)aminobenzene 5'-phosphate + [1-(2-amino-7-methyl-4-oxo-7,8-dihydro-3H-pteridin-6-yl)]ethyl diphosphate = [1-(2-amino-7-methyl-4-oxo-7,8-dihydro-3H-pteridin-6-yl)]ethyl-4-(beta-D-ribofuranosyl)aminobenzene 5'-phosphate + diphosphoric acid.