(3S,4S)-2,2-Dimethyl-3β-hydroxy-4β-(2-oxopyrrolizino)-3,4-dihydro-6-cyano-2H-1-benzopyran;2,2-Dimethyl-3,4-dihydro-6-cyano-4β-(2-oxopyrrolidin-1-yl)-2H-1-benzopyran-3β-ol
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