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2-??-5,6-?????-4H-??

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???(??):: 2H-Pyran, 3,4-dihydro-6-methyl-;Pentoxifylline Impurity 21;Pentoxifylline Impurity 12;3,4-Dihydro-6-methyl-2H-pyran;2-Methyl-5,6-dihydro-4H-pyran

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Theobromine Pentoxifylline Impurity I 3-Methylxanthine 1,1′-Trimethylenedi-theobromine Pentoxifylline 1,1'-Methylene Bis[TheobroMine] Theophylline 1,1'-[(5E)-5-Methyl-7-oxo-5-undecene-1,11-diyl] Bis 3,7-Dihydro-3,7-diMethyl-6-[(5-oxohexyl)oxy]-2H-purin-2-one Pentoxifylline Impurity 8(Pentoxifylline EP Impurity H)