You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(1-methylcyclopentyl)methyl]-3-[(5S,9S)-6-oxa-2-thiaspiro[4.5]decan-9-yl]urea is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H28N2O2S
assistant