英文别名Doxofylline Impurity 4; Doxofylline Impurity 6; Doxofylline Impurity 9; Doxofylline Impurity 12; 7-(2,2-dimethoxyethyl)-1,3-dimethyl-3,7-dihydro-1H-purine-2,6-dione; 1H-Purine-2,6-dione, 7-(2,2-dimethoxyethyl)-3,7-dihydro-1,3-dimethyl-; Doxofylline 2,2-Dimethoxyethyl; Theophylline impurities822