137319-25-6 1H-Pyrrolo(2,3-d)pyrimidine-5-carboxamide, 2-amino-N-(3-amino-3-iminopropyl)-4,7-dihydro-4-oxo- Echiguanine A N-(2-Amidinoethyl)-2-amino-4-hydroxy-7H-pyrrolo(2,3-d)pyrimidine-5-carboxamide