Abstract
Three pairs of new enantiomeric alkaloids with an unprecedented spiro indolinone-naphthofuran skeleton were isolated from a marine Streptomyces sp. The pure enantiomers had a marked difference in the enantiomerization processes for the three compounds. DFT calculations in combination with chemical derivatization were performed to corroborate the racemization process via a keto-enol-type tautomerism.
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