You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-N-[5-(3-ethoxyphenyl)sulfonyl-1,3-thiazol-2-yl]-5-N-(2-pyrrolidin-1-ylethyl)pyridine-2,5-diamine is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H27N5O3S2
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