You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 6-[(3-pyridin-3-yl-1,3-dihydropyrrolo[1,2-c][1,3]thiazole-7-carbonyl)amino]hexanoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H25N3O3S
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