MIBG Hemisulfate Precursor for [*I]Metaiodobenzylguanidine (3-Iodobenzyl)guanidine hemisulfate; meta-Iodobenzylguanidine hemisulfate; Iobenguane sulfate CA index name: Guanidine, [(3-iodophenyl)methyl]-, sulfate (2:1) Characteristics: Molar mass 324.13 CAS RN [87862-25-7] Purity ≥ 99 % (HPLC) White to off-white solid Certificates: CoA: appearance, ¹H NMR spectrum, HPLC