2-Amino-9-[[(1,3-dihydroxypropan-2-yl)oxy]methyl]-1,9-dihydro-6H-purin-6-one , 2-((2-Amino-3-nitroso-6-oxo-3,6-dihydro-9H-purin-9-yl)methoxy)-3-hydroxypropyl L-valinate.