3,7-Dihydro-1,3,7-tri(methyl-13C)-1H-purine-2,6-dione; 1,4,6-Trimethyl-1H-imidazo[4,5-b]pyridine-5,7(4H,6H)-dione-13C3; 1,3,7-Trimethylxanthine-13C3; 7-Methyltheophylline-13C3; Alert-Pep-13C3; Cafalgine-13C3; Cafeina-13C3; Caffedrine-13C3; Caffein-13C3; Cafipel-13C3; DHCplus-13C3; Dasin-13C3; Diurex-13C3; Durvitan-13C3; Guaranine-13C3; Hycomine-13C3; Koffein-13C3; Mateina-13C3; Methyltheobromine-13C3; Miudol-13C3; NSC 5036-13C3; New Cetamol-13C3; No-Doz-13C3; Palergot-C-13C3; Phensal-13C3; Refresh'n-13C3; SK 65 Compound-13C3; Shape Plus-13C3; Stay Alert-13C3; Stim-13C3; Synalgos-13C3; Thein-13C3; Theine-13C3; Tri-Aqua-13C3; Wigraine-13C3;
