 በእነዚህ ምላሾች ውስጥ የበለጠ ንቁ ተሳትፎዎች 4- (1-pyrrolidinyl) pyridine እና 4-dimethylaminopyridine (DMAP) ናቸው, እነሱም የፒሪይን ዘይቤዎች ናቸው.
Xitaa xitaa firfircoon ee fal-celintaasi waa 4- (1-pyrrolidinyl) pyridine iyo 4-dimethylaminopyridine (DMAP), oo ah noocyada pyridine.