You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (6S)-2-(pyridin-4-ylmethyl)-8-[3-(tetrazol-1-yl)propanoyl]-2,8-diazaspiro[5.5]undecan-3-one into molecular formula.
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C19H25N7O2
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