This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anaesthesia
Which of the following is not an amino steroid derivative – 
Select and explain. 
A. Alcuronium, B. Vecuronium, C. Pancuronium, D. Pipecuronium
A: Alcuronium
Answer: A: Alcuronium 
Explanation: Vecuronium, Pancuronium, Pipecuronium are aminosteroids. Alcuronium is benzylisoquinolone.