Abstract
Four new lignans, (+)-diayangambin; (+)-excelsin; (+)-epiexcelsin and (+)-demethoxyexcelsin, were isolated from leaves of Macropiper excelsum and their structures and configurations have been determined by spectroscopic studies. Diayangambin is only the second naturally occurring diaxially substituted 3,7-dioxabicyclo-[3,3,0]-octane to have been isolated.
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