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What is the molecular formula of the compound with this IUPAC name (1S,4R,13S)-4-ethenyl-4'-hydroxy-3',11-dimethylspiro[5-azatricyclo[8.3.0.01,5]tridec-10-ene-13,5'-furan]-2',6,12-trione ?
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C19H21NO5
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