22305-69-7 3,7-Dimethyl-2,6-dioxo-1,2,3,6-tetrahydro-7H-purine-8-propionamide 7H-Purine-8-propionamide, 1,2,3,6-tetrahydro-3,7-dimethyl-2,6-dioxo- 8-Caffeine-propionamide