You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (E)-5-[2-(4-methoxyphenyl)cyclopropyl]-3-methylsulfanyl-5-oxo-2-thiophen-2-ylpent-2-enenitrile by IUPAC nomenclature, provide its molecular formula.
user
C20H19NO2S2
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