You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 3-ethyl-1-propan-2-ylazetidine;(3R)-3-ethyl-1-propan-2-ylpyrrolidine;(3R)-3-methyl-1-propan-2-ylpyrrolidine;1-propan-2-ylpyrrolidine .
user
C32H68N4
assistant