Abstract 2-Methyl-2-[[(7-methyl-7H-benzo [c] carbazol-10-yl) methyl] amino]-1, 3-propanediol (1, 7U85) was synthesized as the mesylate salt in the [14 C]-labelled form with specific activity 48.4 mCi/mmol suitable for metabolism and tissue distribution studies in animals The synthetic sequence involved the regiospecific synthesis of a bromobenzo [c] carbazole by a modified Fischer indole synthesis, formylation by a Bouveault reaction, and reductive ...