You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[[1-[2-[(4-methylphenyl)sulfonylamino]-4-methylsulfanylbutanoyl]piperidine-4-carbonyl]amino]acetic acid by IUPAC nomenclature, provide its molecular formula.
user
C20H29N3O6S2
assistant