You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(1,3-benzodioxol-5-yl)-2-(2,3-dihydro-1,4-benzodioxin-6-ylsulfanyl)propanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H17NO5S
assistant