Synonyms: Theophylline,7-(2-hydroxypropyl)- (6CI,7CI,8CI); (?à)-Proxyphyllin; 1,3-Dimethyl-7-(2-hydroxypropyl)xanthine;2,6-Dioxo-3,7-dihydro-7-(2-hydroxypropyl)-1,3-dimethylpurine;2-Hydroxypropyl-7-theophylline; 7-(2-Hydroxypropyl)theophylline; 7-(b-Hydroxypropyl)-1,3-dimethylxanthine;7-(b-Hydroxypropyl)theophylline;Brontyl; Hydroxypropyltheophylline; Monophylline; NSC 163343;Oxypropyltheophylline; Proxiphylline; Proxy-Retardoral; Proxyphylline;Purophyllin; Sanwaphyllin; Sigophyl; Spantin; Spasmolysin; Thean; Theoden;Theon; b-Hydroxypropyltheophylline