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8-Methoxymethyl-3-isobutyl-1-methylxanthine (8-Methoxymethyl-IBMX). White solid. Selective inhibitor of Ca2+-calmodulin-dependent phosphodiesterase (PDE I IC50 = 4 mM). Purity: >98% by TLC. Soluble in DMSO and EtOH. CAS 78033-08-6 M.W. 266.3.