You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (1-oxidopyrimidin-1-ium-2-yl)methyl 1-(4-propan-2-ylphenyl)sulfonylpiperidine-4-carboxylate by IUPAC nomenclature, provide its molecular formula.
user
C20H25N3O5S
assistant