10-formyldihydrofolate + 5-amino-1-(5-phospho-beta-D-ribosyl)imidazole-4-carboxamide => 5-formamido-1-(5-phospho-D-ribosyl)imidazole-4-carboxamide + 7,8-dihydrofolate
10-formyldihydrofolate + 5-amino-1-(5-phospho-beta-d-ribosyl)imidazole-4-carboxamide => 5-formamido-1-(5-phospho-d-ribosyl)imidazole-4-carboxamide + 7,8-dihydrofolate