You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 4-[[[2-(4,6-dimethylpyrimidin-2-yl)sulfanylacetyl]hydrazinylidene]methyl]benzoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H18N4O3S
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