You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(4S)-2,4-dimethyl-5-[2-methyl-4-(2-methylpyrimidin-4-yl)phenoxy]pentan-2-yl]carbamic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H27N3O3
assistant