You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1R,3R,3aR,6aS)-7'-chloro-5-[2-(3,4-dimethoxyphenyl)ethyl]-1-[(1S)-1-hydroxyethyl]spiro[1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3,3'-1H-indole]-2',4,6-trione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C25H26ClN3O6
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