<prompt> Laudanosine is a metabolite of -MivacuriumAtracuriumPancuroniumGantacurium  <response>: Ans. is b i.e., Atracurium Atracurium It is a bisquarternary competitive blocker, 4 times less potent than pancuronium. Unique feature is its inactivation in plasma by spontaneous non - enzymatic degradation called as Hoffman elimination.Following degradation it produces a metabolite - laudanosine. Metabolite Laudanosine may induce seizures in some patients. 