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guanylic acid[gwə′nil·ik ′as·əd]
a mononucleotide consisting of a nitrogenous base (guanine), a carbohydrate (D-ribose), and one molecule of phosphoric acid:
Guanylic acid is a part of the composition of ribonucleic acids; their alkaline hydrolysis usually yields guanosine-3-phosphate. It is also present in small amounts as guanosine-5-phosphate in tissues.