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system
Provide the molecular formula for the IUPAC named substance 7-hydroxy-1'-(1H-indol-3-ylmethyl)-2-methylspiro[6,7,8,8a-tetrahydropyrrolo[1,2-a]pyrazine-4,3'-azetidine]-1,3-dione .
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C19H22N4O3
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