You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-(2-chloro-5-methoxypyridin-4-yl)-6-methyl-N-(2-oxo-3H-1,3,4-thiadiazol-5-yl)pyridine-3-carboxamide;1-oxaspiro[4.4]nonane The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H26ClN5O4S
assistant