You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 2-[2-[2-chloro-4-fluoro-5-[3-methyl-2,6-dioxo-4-(trifluoromethyl)pyrimidin-1-yl]phenyl]imino-3-methyl-4-oxo-3-prop-2-enyl-1,3-thiazolidin-3-ium-5-yl]acetamide is given. What is its corresponding molecular formula?
user
C21H19ClF4N5O4S+
assistant