You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-ethyl-3-(phenylsulfanylmethyl)-N'-([1,2,4]triazolo[4,3-a]pyridin-3-ylmethyl)pyrrolidine-1-carboximidamide;hydroiodide into molecular formula.
user
C21H27IN6S
assistant