You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 6-amino-3-[2-(2,5-dimethylphenyl)sulfonylethyl]-1-methyl-5-piperidin-1-ylpyrimidine-2,4-dione into its molecular formula.
user
C20H28N4O4S
assistant