You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(6-chloro-7-methyl-4-oxochromen-3-yl)-3-(2-methylsulfanylethyl)-5-(2-methylsulfonylethyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3-carboxylic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H25ClN2O8S2
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