You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 2-acetamido-3-[(5-oxo-4-propan-2-yl-1H-1,2,4-triazol-3-yl)sulfanyl]propanoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C11H18N4O4S
assistant