You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(3,4-diethoxyphenyl)-2-[(5,6-difluoro-1H-benzimidazol-2-yl)sulfanyl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H19F2N3O3S
assistant