You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(4S)-6-(4-chlorophenyl)-8-methoxy-1-methyl-4H-[1,2,4]triazolo[4,3-a][1,4]benzodiazepin-4-yl]-N-(2-fluorophenyl)acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H21ClFN5O2
assistant