You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[4-(2-pyrrolidin-1-ylethoxy)phenyl]-5-(4-thiophen-3-ylphenyl)-[1,2,4]triazolo[1,5-a]pyridin-2-amine is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H27N5OS
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