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 N-(2-ethoxyphenyl)-2-[(4-ethyl-1,1-dioxo-1lambda6,2,4-benzothiadiazin-3-yl)sulfanyl]acetamide .
user
C19H21N3O4S2
assistant