You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-[[4-(diethylsulfamoyl)phenyl]methyl]-3-(4-methyl-2-oxo-1,3-thiazol-3-yl)propanamide into molecular formula.
user
C18H25N3O4S2
assistant