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What is the molecular formula of the molecule identified by (1R,3S,3aS,6aS)-7'-chloro-5'-methyl-5-(2-phenylethyl)-1-propan-2-ylspiro[1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3,3'-1H-indole]-2',4,6-trione ?
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