You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 1-[[(2S)-1-[5-(methanesulfonamido)pyridine-3-carbonyl]piperidin-2-yl]methyl]-3-phenylurea by IUPAC nomenclature, provide its molecular formula.
user
C20H25N5O4S
assistant