You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
butyl-[3-[[2-[(3-chlorophenyl)methylidene]-3-oxo-4H-1,4-benzothiazine-6-carbonyl]amino]propyl]-propylazanium is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H33ClN3O2S+
assistant