1-(5'-Phosphoribosyl)-N-formylglycinamidine 2-(Formamido)-N1-(5'-phosphoribosyl)acetamidine 2-(Formamido)-N1-(5-phospho-D-ribosyl)acetamidine 5'-Phosphoribosyl-N-formylglycinamidine 5'-Phosphoribosylformylglycinamidine C04640