4-Carboxyphenylglyoxal GMP 72209-16-6 Benzoic acid, 4-(4,6,7,9-tetrahydro-6,7-dihydroxy-9-oxo-3-(5-O-phosphono-beta-D-ribofuranosyl)-3H-imidazo(1,2-a)purin-7-yl)- p-Carboxyphenylglyoxal GMP