You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N'-[2-[3-(3-chlorophenyl)-1,2,4-oxadiazol-5-yl]ethyl]-N-ethyl-3-pyrrolidin-1-ylpyrrolidine-1-carboximidamide;hydroiodide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H30ClIN6O
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