You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl (3R,4R)-4-(4-chlorophenyl)-5-cyano-6-methylsulfanyl-2-oxo-3,4-dihydro-1H-pyridine-3-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C15H13ClN2O3S
assistant