5-amino-1-(5-phospho-D-ribosyl)imidazole from N(2)-formyl-N(1)-(5-phospho-D-ribosyl)glycinamide: step 2/2. {ECO:0000256|HAMAP-Rule:MF_00741, ECO:0000256|RuleBase:RU004371, ECO:0000256|SAAS:SAAS00384047}.