1H-Purine-2,6-dione, 3,7-dihydro-7-((5-(2-(diethylamino)ethyl)-1,2,4-oxadiazol-3-yl)methyl)-1,3-dimethyl- 7-((5-(2-diethylaminoethan-1-yl)-1,2,4-oxadiazol-3-yl)methyl)theophylline 88338-70-9