1,9-Dihydro-2-amino-9-(4-hydroxy-3-(hydroxymethyl)butyl)-6H-purin-6-one monosodium salt 2-Amino-1,9-dihydro-9-(4-hydroxy-3-(hydroxymethyl)butyl)-6H-purin-6-one monosodium salt 39809-25-1 9-(4-Hydroxy-3-(hydroxymethyl)butyl)guanine monosodium salt 97845-62-0 BRL 39123-D Penciclovir sodium Penciclovir sodium [USAN]