((2-(2-Amino-1,6-dihydro-6-oxo-9H-purin-9-yl)ethoxy)methyl)phosphonic acid 114088-58-3 5-(3-Hydroxy-2-phosphonomethoxypropylguanine) 9-((2-Phosphonylmethoxy)ethyl)guanine PMEG Phosphonic acid, ((2-(2-amino-1,6-dihydro-6-oxo-9H-purin-9-yl)ethoxy)methyl)-