3-Bromo-4-iodo-1-(triisopropylsilyl)-1H-pyrrole is an intermediate for the synthesis of MS094 (M755450), which is a derivative of MS023 (M755443). MS023 is a potent inihbitor of PRMTs 1,3,4,6,and 8 (IC50 = 30, 119, 83, 8, and 8 nM, respectively), which are responsible for asymmetric dimethylation of arginine residues.