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-[(Z)-[5-(difluoromethylsulfanylmethyl)furan-2-yl]methylideneamino]-3-ethyl-4-oxophthalazine-1-carboxamide into molecular formula.
user
C18H16F2N4O3S
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