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Guanosine is a molecule (known as a nucleoside) that is formed when guanine is attached to a ribose ring (also known as a ribofuranose) via a β-N9-glycosidic bond.

Guanosine can be phosphorylated to become GDP (guanosine diphosphate) and GTP (guanosine triphosphate) among other things.

If guanine is attached to a deoxyribose ring, it is known as a deoxyguanosine.