You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 1-[4-[5-(nitrosomethyl)-6-(4-phenoxyphenyl)pyridin-2-yl]piperidin-1-yl]prop-2-en-1-one by IUPAC nomenclature, provide its molecular formula.
user
C26H25N3O3
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