77196-87-31,1'-Methylene Bis[Theobromine]Pentoxifylline EP Impurity EA3YLV2M7UG1H-Purine-2,6-dione, 1,1'-methylenebis[3,7-dihydro-3,7-dimethyl-1,1'-Methylene bis(theobromine)1-[(3,7-DIMETHYL-2,6-DIOXOPURIN-1-YL)METHYL]-3,7-DIMETHYLPURINE-2,6-DIONEUNII-A3YLV2M7UGPentoxifylline impurity E [EP]1,1-Methylenebis(3,7-dimethyl-3,7-dihydro-1H-purine-2,6-dione)