You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-[(3R)-1-[2-(3,4-dimethoxyphenyl)ethyl]-2,5-dioxopyrrolidin-3-yl]sulfanylpyridine-3-carboxylate into its molecular formula.
user
C20H19N2O6S-
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