You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named (7S)-2-cyclopropylsulfonyl-7-(pyridin-4-ylmethoxy)-5-thia-2-azaspiro[3.4]octane is given. What is its corresponding molecular formula?
user
C15H20N2O3S2
assistant