You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (1R,3S,3aR,6aS)-5-(2-methyl-3-nitrophenyl)-1-(2-methylsulfanylethyl)spiro[1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3,3'-1H-indole]-2',4,6-trione ?
user
C23H22N4O5S
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