M 4602 (OTTO) 1-Methyl-5-chloro-4-nitroimidazole, 98% Cas - 4897-25-0 - used in the synthesis of 5-aryl-1-methyl-4-nitroimidazoles, via Suzuki coupling with arylboronic acids, catalyzed by dichlorobis-(triphenylphosphine)palladium(II), K2CO3 and tetrabutylammonium bromide.