You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[5-[(7-chloro-1,3-benzodioxol-5-yl)methylsulfanyl]-4-(oxolan-2-ylmethyl)-1,2,4-triazol-3-yl]propanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H21ClN4O4S
assistant