You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[6-[7-chloro-1-hydroxy-6-(methylamino)-3-oxoisoquinolin-2-yl]pyridin-3-yl]-3-(5-chlorothiophen-2-yl)sulfonylurea is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H15Cl2N5O5S2
assistant