Synonyms: 1H-Purine-2,6-dione,3,7-dihydro-7-[2-[(2-hydroxy-1-methyl-2-phenylethyl)amino]ethyl]-1,3-dimethyl-,monohydrochloride, [R-(R*,S*)]-; Theophylline, 7-[2-[(b-hydroxy-a-methylphenethyl)amino]ethyl]-,monohydrochloride (8CI); Norephedrine theophylline; [R-(R*,S*)]-3,7-Dihydro-7-[2-[(2-hydroxy-1-methyl-2-phenylethyl)amino]ethyl]-1,3-dimethyl-1H-purine-2,6-dionemonohydrochloride