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What is the molecular formula of the molecule identified by (3aR,6aS)-5-(2-methoxyethyl)-1,6',7'-trimethylspiro[1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3,3'-1H-indole]-2',4,6-trione ?
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C19H23N3O4
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