You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4R)-2-(2-methoxyethyl)-4-(methoxymethyl)-8-[(5-methylthiophen-2-yl)methyl]-2,8-diazaspiro[4.5]decane The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H32N2O2S
assistant