((2-(6-Amino-9H-purin-9-yl)-1-methylethoxy)methyl)phosphonic acid 107021-12-5 121149-89-1 9-(2-Phosphonomethoxypropyl)adenine 9-(2-Phosphonylmethoxypropyl)adenine Apropovir Phosphonic acid, ((2-(6-amino-9H-purin-9-yl)-1-methylethoxy)methyl)-