You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[3-(2-benzyl-1,2,4-triazol-3-yl)morpholin-4-yl]-5-methyl-1,3-benzoxazole The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H21N5O2
assistant