You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-methyl-4-(3-methylbut-2-enyl)-N-(2-pyrrolidin-1-ylethyl)thieno[3,2-b]pyrrole-5-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H27N3OS
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