You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[3-ethoxypropyl-(4-methylphenyl)sulfonylamino]-N-(5-methyl-1,2-oxazol-3-yl)acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H25N3O5S
assistant