You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[4-(3-methoxyphenyl)sulfonyl-2-(3-methyl-1,2,4-oxadiazol-5-yl)-1,4-diazepan-1-yl]propan-1-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H24N4O5S
assistant