摘要：

A number of dimethylbenzodipyranones and 3-methylbut-2-enyl-4-n-propyl-5,7-dihydroxycoumarins, including mammeigin and mammea's B/AA and B/AB have been synthesised, showing that MAB5 and MAB6 are mixtures, the structure of ponnalide requires revision, and that a number of these compounds are present in the seed extract of Mammea americana L.

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