You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 5-[4-(5-acetyl-4-methyl-1,3-thiazol-2-yl)piperidine-1-carbonyl]thiophene-2-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H20N2O4S2
assistant