You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl (2S)-2-[(2-methylpropan-2-yl)oxycarbonylamino]-3-(4-pyrimidin-5-ylphenyl)propanoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H25N3O4
assistant