Detection of 5′-phosphoribosyl-4-(N-succinylcarboxamide)-5-aminoimidazole in urine by use of the Bratton-Marshall reaction: identification of patients deficient in adenylosuccinate lyase activity. - Laikind,P.K.; Seegmiller,J.E.; Gruber,H.E. (Anal Biochem, 1986)