for the following products
2-Amino-1,9-[[2-hydroxy-1-(hydroxymethyl)ethoxy]methyl]6H-purin-6-one | 2-Amino-9-{[(1,3-dihydroxypropan-2-yl)oxy]methyl}-6,9-dihydro-1H-purin-6-one | 9-(1,3-Dihydroxy-2-propoxymethyl)guanine | Gancyclovir | Gancyclovir sodium and Ganciclovir
