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. Vecuronium, B. Alcuronium, C. Pancuronium, D. Pipecuronium
B: Alcuronium
Answer: B: Alcuronium 
Explanation: Alcuronium chloride is a neuromuscular blocking agent, alternatively referred to as a skeletal muscle relaxant.
It is a semi-synthetic substance prepared from C-toxiferine I, a bis-quaternary alkaloid obtained from Strychnos toxifera.