– PRP-194, CAS#596085-87-9, has a chemical name 5-chloro-2,3,3-trimethyl-3H-pyrrolo[2,3-b]pyridine, is a useful precursor for chemical synthesis of bioactive molecules and dyes. There is no formal name for this chemical. For the convenience of communication, we temporally called it as PRP-194, in which PRP is originated from PyRrolo[2,3-b]Pyridine, and 194 is originated from its molecule weight 194.