You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-[(2S,3R,6S)-2-(hydroxymethyl)-6-[2-(oxane-4-carbonylamino)ethyl]oxan-3-yl]pyridine-4-carboxamide into molecular formula.
user
C20H29N3O5
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