Coumarins and flavones from Casimiroa pringlei.

[摘要]：A chem. study of the leaves of Casimiroa pringlei led to the isolation of six coumarins, six flavones and the sesquiterpene, cryptomeridiol. Four of these compds. are new natural products which, on the basis of spectroscopic analyses, were characterized as (Z)-trichoclin acetate, 5,3',5'-trimethoxyflavone, 5,2',3',4'-tetramethoxyflavone, and 5,2',3',4',5',6'-hexamethoxyflavone. Although 5,2',3',4'-tetramethoxyflavone has been obtained by synthesis, this is the first report of its isolation from a natural source.

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