You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-benzyl-N-(2-oxo-1,3,4,5-tetrahydropyrrolo[1,2-b]diazepin-3-yl)-1H-1,2,4-triazole-3-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H18N6O2
assistant