You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-chloro-5-(3-propan-2-yl-2-azaspiro[3.4]octane-2-carbonyl)-1,2-thiazol-3-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C14H19ClN2O2S
assistant