You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[6-(1,3-benzodioxol-5-yl)pyridazin-3-yl]sulfanyl-N-[[(2R)-oxolan-2-yl]methyl]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H19N3O4S
assistant