CAS 28822-58-4 appears in our catalog under these names: IBMX, 3-Isobutyl-1-methylxanthine, >95% (HPLC), IBMX/ 99.8% (existing batch purity), 3-Isobutyl-1-methylxanthine , 3-Isobutyl-1-methylxanthine. Offered by: Chemat Brand, TRC, TargetMol, GLPBio, Thermo Scientific (Alfa Aesar). Available pack sizes: on request, 1g, 5g, 25mg, 50mg, 100mg, 200mg, 10mM (in 1ml dmso).