IBMX. A phosphodiesterase (PDE) inhibitor, Synonyms: 3,7-Dihydro-1-methyl-3-(2-methylpropyl)-1H-purine-2,6-d ione; 3-Isobutyl-1-methylxanthine; NSC 165960; SC 2964, Purity: G98% by High-performance liquid chromatography, CAS Number: 28822-58-4, Molecular Formula: C1GH1GNGO2, 100mg.