You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (E)-2-cyano-3-(3,4-dihydroxy-5-methylphenyl)-N-[(4-hydroxy-2-methyl-3,5-dioxocyclohexyl)methyl]prop-2-enethioamide into its molecular formula.
user
C19H20N2O5S
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