You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-benzyl-2-(furan-2-yl)-N-(2-hydroxyethyl)-4-methyl-6-methylsulfanylpyrimidine-5-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H21N3O3S
assistant