You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[[(6R)-5-(pyridin-2-ylmethyl)-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-6-yl]methyl]morpholine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H25N5O
assistant