You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-2-(methoxymethyl)-1-methyl-8-pyridin-3-ylsulfonyl-1,8-diazaspiro[4.5]decane is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H25N3O3S
assistant