1,3-Dimethyluric acid-13C4,15N3
1,3-Dimethyluric acid-13C4,15N3 is the 13C-labeled and 15N-labeled 1,3-Dimethyluric acid. 1,3-Dimethyluric acid is a product of theophylline metabolism in man. 1,3-Dimethyluric acid is one of the purine components in urinary calculi.