Synonyms: 1,2,3,6-Tetrahydro-1,3-dimethyl-2,6-dioxopurine-7-aceticacid;7-(Carboxymethyl)theophylline;7-Theophyllineacetic acid;7-Theophyllinylacetic acid;Acefylline;Acephylline;Carboxymethyltheophylline;N-7-Theophyllineacetic acid;NSC 52996;Theophyllineacetic acid;Purine-7-aceticacid, 1,2,3,6-tetrahydro-1,3-dimethyl-2,6-dioxo- (6CI,7CI,8CI);