You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R,3R)-N-[2-(2-cyclopropylpyrimidin-5-yl)ethyl]-3-methyl-2-phenylazetidine-1-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H24N4O
assistant