You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
8-O-tert-butyl 7-O-methyl (1S,4S,7R)-2-[(4-methoxyphenyl)methyl]-3-oxo-1-thiophen-2-yl-5-thia-2,8-diazaspiro[3.4]octane-7,8-dicarboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C24H28N2O6S2
assistant