You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(1S)-1-(1-benzofuran-2-yl)ethyl]-N,5-dimethyl-2-phenyltriazole-4-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H20N4O2
assistant