You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(1S,4aR,11S,11aS,12aS)-3-carbamoyl-10-chloro-4,4a,6,7,11-pentahydroxy-2,5-dioxo-11,11a,12,12a-tetrahydro-1H-tetracen-1-yl]-dimethylazanium;chloride The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H22Cl2N2O8
assistant