5'-Guanylic acid - 13 C 10 , 15 N 5 (5'-GMP- 13 C 10 , 15 N 5 dilithium; 5'-guanosine monophosphate- 13 C 10 , 15 N 5 ) dilithium is 13 C and 15 N-labeled 5'-Guanylic acid. 5'-Guanylic acid (5'-GMP) is involved in several metabolic disorders, including the AICA-ribosiduria pathway, adenosine deaminase deficiency, adenine phosphoribosyltransferase deficiency (aprt), and the 2-hydroxyglutric aciduria pathway.