You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(6R)-3-methylsulfanyl-6-(4-phenylmethoxyphenyl)-6H-[1,2,4]triazino[5,6-d][3,1]benzoxazepin-7-yl]ethanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H22N4O3S
assistant