1,3,7-trimethyl-1H-purine-2,6(3H,7H)-dione;CAFFEIN;METHYLTHEOBROMIDE;METHYLTHEOBROMINE;COFFEINUM;GUARANINE;1,3,7-Trimethyxanthine; Theophylline EP Impurity A ; Pentoxifylline EP Impurity F
1,3,7-trimethyl-1H-purine-2,6(3H,7H)-dione;CAFFEIN;METHYLTHEOBROMIDE;METHYLTHEOBROMINE;COFFEINUM;GUARANINE;1,3,7-Trimethyxanthine; Theophylline EP Impurity A ; Pentoxifylline EP Impurity F