You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-methyl-4-[(3-phenyl-1H-1,2,4-triazol-5-yl)methylamino]pentan-2-yl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H25N5O
assistant