You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 2-methyl-7-[2-(4-methylsulfonylphenyl)acetyl]-5,6,8,9-tetrahydro-[1,2,4]triazolo[4,3-d][1,4]diazepin-3-one .
user
C16H20N4O4S
assistant