You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(1-amino-3-methyl-1-oxopentan-2-yl)-1,5-diphenyl-1,2,4-triazole-3-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H23N5O2
assistant