A new compound was isolated from a commercial sample of Cape aloe, and its structure was determined by spectral analysis. This benzo[ f ]chroman-3-one ( 1 ) occurs in the drug in racemic form. The synthesis of an analogous chromanone ( 9 ) via intramolecular thermal acid-catalyzed cyclization of the 2-naphthyl cinnamate ( 11 ) strongly supports the formation of 1 as a process product.
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Speranza et al. (1996) studied this question.
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