You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (4S)-2-amino-4-[4-methoxy-3-(pyridin-2-ylsulfanylmethyl)phenyl]-7-methyl-5-oxo-4H-pyrano[3,2-c]pyran-3-carbonitrile into molecular formula.
user
C23H19N3O4S
assistant