Guanosine monophosphate
IUPAC name	[(2R,3S,4R,5R)-5-(2-Amino-6-oxo-3H-purin-9-yl)-3,4-dihydroxyoxolan-2-yl]methyl dihydrogen phosphate
Other names	5'-Guanidylic acid Guanylic acid E number E626
Identifiers
Abbreviations	GMP
CAS number	[85-32-5]
PubChem	6804
MeSH	Guanosine+monophosphate
SMILES	C1=NC2=C(N1[C@H]3[C@@H]([C@@H]([C@H](O3)COP(=O)(O)O)O)O)NC(=NC2=O)N
Properties
Molecular formula	C10H14N5O8P
Molar mass	363.22 g/mol
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox references

Guanosine monophosphate, also known as 5'-guanidylic acid or guanylic acid and abbreviated GMP, is a nucleotide that is found in RNA. It is an ester of phosphoric acid with the nucleoside guanosine. GMP consists of the phosphate group, the pentose sugar ribose, and the nucleobase guanine. Guanosine monophosphate is produced from dried fish or dried seaweed.^{citation needed}

Guanosine monophosphate in the form of its salts, such as disodium guanylate (E627), dipotassium guanylate (E628) and calcium guanylate (E629), are food additives used as flavor enhancers to provide the umami taste. It is often used in synergy with glutamic acid (monosodium glutamate, MSG). As it is a fairly expensive additive, it is usually not used independently of glutamic acid. If guanylate salts are present in a list of ingredients but MSG does not appear to be, it is likely that glutamic acid is provided as part of another ingredient, such as a processed soy protein complex. Disodium guanylate is often added to foods in conjunction with disodium inosinate; the combination is known as disodium 5'-ribonucleotides. Disodium guanylate is often found in instant noodles, potato chips and snacks, savoury rice, tinned vegetables, cured meats, and packet soup.

See also

• Hypoxanthine-guanine phosphoribosyltransferase