You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as [4-[(2-methylphenyl)methyl]piperazin-1-yl]-[4-(1,2,4-triazol-1-yl)phenyl]methanone using the IUPAC nomenclature.
user
C21H23N5O
assistant